diff --git a/api/gen/proto/go/querier/v1/querier.pb.go b/api/gen/proto/go/querier/v1/querier.pb.go
index 077f4b8868..2dfdbfc078 100644
--- a/api/gen/proto/go/querier/v1/querier.pb.go
+++ b/api/gen/proto/go/querier/v1/querier.pb.go
@@ -1018,6 +1018,8 @@ type SelectSeriesRequest struct {
 	Aggregation *v1.TimeSeriesAggregationType `protobuf:"varint,7,opt,name=aggregation,proto3,enum=types.v1.TimeSeriesAggregationType,oneof" json:"aggregation,omitempty"`
 	// Select stack traces that match the provided selector.
 	StackTraceSelector *v1.StackTraceSelector `protobuf:"bytes,8,opt,name=stack_trace_selector,json=stackTraceSelector,proto3,oneof" json:"stack_trace_selector,omitempty"`
+	// Select the top N series by total value.
+	Limit *int64 `protobuf:"varint,9,opt,name=limit,proto3,oneof" json:"limit,omitempty"`
 }
 
 func (x *SelectSeriesRequest) Reset() {
@@ -1108,6 +1110,13 @@ func (x *SelectSeriesRequest) GetStackTraceSelector() *v1.StackTraceSelector {
 	return nil
 }
 
+func (x *SelectSeriesRequest) GetLimit() int64 {
+	if x != nil && x.Limit != nil {
+		return *x.Limit
+	}
+	return 0
+}
+
 type SelectSeriesResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1578,7 +1587,7 @@ var file_querier_v1_querier_proto_rawDesc = []byte{
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@@ -1600,138 +1609,140 @@ var file_querier_v1_querier_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/api/gen/proto/go/querier/v1/querier_vtproto.pb.go b/api/gen/proto/go/querier/v1/querier_vtproto.pb.go
index fd94196998..855921b0fe 100644
--- a/api/gen/proto/go/querier/v1/querier_vtproto.pb.go
+++ b/api/gen/proto/go/querier/v1/querier_vtproto.pb.go
@@ -401,6 +401,10 @@ func (m *SelectSeriesRequest) CloneVT() *SelectSeriesRequest {
 			r.StackTraceSelector = proto.Clone(rhs).(*v1.StackTraceSelector)
 		}
 	}
+	if rhs := m.Limit; rhs != nil {
+		tmpVal := *rhs
+		r.Limit = &tmpVal
+	}
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -1033,6 +1037,9 @@ func (this *SelectSeriesRequest) EqualVT(that *SelectSeriesRequest) bool {
 	} else if !proto.Equal(this.StackTraceSelector, that.StackTraceSelector) {
 		return false
 	}
+	if p, q := this.Limit, that.Limit; (p == nil && q != nil) || (p != nil && (q == nil || *p != *q)) {
+		return false
+	}
 	return string(this.unknownFields) == string(that.unknownFields)
 }
 
@@ -2544,6 +2551,11 @@ func (m *SelectSeriesRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.Limit != nil {
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(*m.Limit))
+		i--
+		dAtA[i] = 0x48
+	}
 	if m.StackTraceSelector != nil {
 		if vtmsg, ok := interface{}(m.StackTraceSelector).(interface {
 			MarshalToSizedBufferVT([]byte) (int, error)
@@ -3288,6 +3300,9 @@ func (m *SelectSeriesRequest) SizeVT() (n int) {
 		}
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
+	if m.Limit != nil {
+		n += 1 + protohelpers.SizeOfVarint(uint64(*m.Limit))
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -5637,6 +5652,26 @@ func (m *SelectSeriesRequest) UnmarshalVT(dAtA []byte) error {
 				}
 			}
 			iNdEx = postIndex
+		case 9:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Limit", wireType)
+			}
+			var v int64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.Limit = &v
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/api/gen/proto/go/query/v1/query.pb.go b/api/gen/proto/go/query/v1/query.pb.go
index a63136b443..462911c277 100644
--- a/api/gen/proto/go/query/v1/query.pb.go
+++ b/api/gen/proto/go/query/v1/query.pb.go
@@ -1052,6 +1052,7 @@ type TimeSeriesQuery struct {
 
 	Step    float64  `protobuf:"fixed64,1,opt,name=step,proto3" json:"step,omitempty"`
 	GroupBy []string `protobuf:"bytes,2,rep,name=group_by,json=groupBy,proto3" json:"group_by,omitempty"`
+	Limit   int64    `protobuf:"varint,3,opt,name=limit,proto3" json:"limit,omitempty"`
 }
 
 func (x *TimeSeriesQuery) Reset() {
@@ -1100,6 +1101,13 @@ func (x *TimeSeriesQuery) GetGroupBy() []string {
 	return nil
 }
 
+func (x *TimeSeriesQuery) GetLimit() int64 {
+	if x != nil {
+		return x.Limit
+	}
+	return 0
+}
+
 type TimeSeriesReport struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1493,76 +1501,77 @@ var file_query_v1_query_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/api/gen/proto/go/query/v1/query_vtproto.pb.go b/api/gen/proto/go/query/v1/query_vtproto.pb.go
index 2144a633fc..7d10e98a88 100644
--- a/api/gen/proto/go/query/v1/query_vtproto.pb.go
+++ b/api/gen/proto/go/query/v1/query_vtproto.pb.go
@@ -375,6 +375,7 @@ func (m *TimeSeriesQuery) CloneVT() *TimeSeriesQuery {
 	}
 	r := new(TimeSeriesQuery)
 	r.Step = m.Step
+	r.Limit = m.Limit
 	if rhs := m.GroupBy; rhs != nil {
 		tmpContainer := make([]string, len(rhs))
 		copy(tmpContainer, rhs)
@@ -991,6 +992,9 @@ func (this *TimeSeriesQuery) EqualVT(that *TimeSeriesQuery) bool {
 			return false
 		}
 	}
+	if this.Limit != that.Limit {
+		return false
+	}
 	return string(this.unknownFields) == string(that.unknownFields)
 }
 
@@ -2209,6 +2213,11 @@ func (m *TimeSeriesQuery) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.Limit != 0 {
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(m.Limit))
+		i--
+		dAtA[i] = 0x18
+	}
 	if len(m.GroupBy) > 0 {
 		for iNdEx := len(m.GroupBy) - 1; iNdEx >= 0; iNdEx-- {
 			i -= len(m.GroupBy[iNdEx])
@@ -2816,6 +2825,9 @@ func (m *TimeSeriesQuery) SizeVT() (n int) {
 			n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 		}
 	}
+	if m.Limit != 0 {
+		n += 1 + protohelpers.SizeOfVarint(uint64(m.Limit))
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -5027,6 +5039,25 @@ func (m *TimeSeriesQuery) UnmarshalVT(dAtA []byte) error {
 			}
 			m.GroupBy = append(m.GroupBy, string(dAtA[iNdEx:postIndex]))
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Limit", wireType)
+			}
+			m.Limit = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Limit |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/api/openapiv2/gen/phlare.swagger.json b/api/openapiv2/gen/phlare.swagger.json
index 7a14fd90c3..dd64945817 100644
--- a/api/openapiv2/gen/phlare.swagger.json
+++ b/api/openapiv2/gen/phlare.swagger.json
@@ -2179,6 +2179,10 @@
           "items": {
             "type": "string"
           }
+        },
+        "limit": {
+          "type": "string",
+          "format": "int64"
         }
       }
     },
diff --git a/api/querier/v1/querier.proto b/api/querier/v1/querier.proto
index 78ae0da066..9f1893432b 100644
--- a/api/querier/v1/querier.proto
+++ b/api/querier/v1/querier.proto
@@ -162,6 +162,8 @@ message SelectSeriesRequest {
   optional types.v1.TimeSeriesAggregationType aggregation = 7;
   // Select stack traces that match the provided selector.
   optional types.v1.StackTraceSelector stack_trace_selector = 8;
+  // Select the top N series by total value.
+  optional int64 limit = 9;
 }
 
 message SelectSeriesResponse {
diff --git a/api/query/v1/query.proto b/api/query/v1/query.proto
index 019491787c..5db7320fcd 100644
--- a/api/query/v1/query.proto
+++ b/api/query/v1/query.proto
@@ -156,6 +156,7 @@ message SeriesLabelsReport {
 message TimeSeriesQuery {
   double step = 1;
   repeated string group_by = 2;
+  int64 limit = 3;
 }
 
 message TimeSeriesReport {
diff --git a/pkg/frontend/frontend_select_time_series.go b/pkg/frontend/frontend_select_time_series.go
index fece898099..620339db22 100644
--- a/pkg/frontend/frontend_select_time_series.go
+++ b/pkg/frontend/frontend_select_time_series.go
@@ -84,5 +84,6 @@ func (f *Frontend) SelectSeries(
 		return nil, err
 	}
 
-	return connect.NewResponse(&querierv1.SelectSeriesResponse{Series: m.TimeSeries()}), nil
+	series := m.Top(int(c.Msg.GetLimit()))
+	return connect.NewResponse(&querierv1.SelectSeriesResponse{Series: series}), nil
 }
diff --git a/pkg/frontend/read_path/query_frontend/query_select_time_series.go b/pkg/frontend/read_path/query_frontend/query_select_time_series.go
index 3e15496a54..db1cc611a4 100644
--- a/pkg/frontend/read_path/query_frontend/query_select_time_series.go
+++ b/pkg/frontend/read_path/query_frontend/query_select_time_series.go
@@ -10,6 +10,7 @@ import (
 
 	querierv1 "github.com/grafana/pyroscope/api/gen/proto/go/querier/v1"
 	queryv1 "github.com/grafana/pyroscope/api/gen/proto/go/query/v1"
+	phlaremodel "github.com/grafana/pyroscope/pkg/model"
 	"github.com/grafana/pyroscope/pkg/validation"
 )
 
@@ -50,6 +51,7 @@ func (q *QueryFrontend) SelectSeries(
 			TimeSeries: &queryv1.TimeSeriesQuery{
 				Step:    c.Msg.GetStep(),
 				GroupBy: c.Msg.GetGroupBy(),
+				Limit:   c.Msg.GetLimit(),
 			},
 		}},
 	})
@@ -59,5 +61,6 @@ func (q *QueryFrontend) SelectSeries(
 	if report == nil {
 		return connect.NewResponse(&querierv1.SelectSeriesResponse{}), nil
 	}
-	return connect.NewResponse(&querierv1.SelectSeriesResponse{Series: report.TimeSeries.TimeSeries}), nil
+	series := phlaremodel.TopSeries(report.TimeSeries.TimeSeries, int(c.Msg.GetLimit()))
+	return connect.NewResponse(&querierv1.SelectSeriesResponse{Series: series}), nil
 }
diff --git a/pkg/frontend/read_path/query_service_handler.go b/pkg/frontend/read_path/query_service_handler.go
index 5e0cc72cad..223de07277 100644
--- a/pkg/frontend/read_path/query_service_handler.go
+++ b/pkg/frontend/read_path/query_service_handler.go
@@ -135,12 +135,17 @@ func (r *Router) SelectSeries(
 	ctx context.Context,
 	c *connect.Request[querierv1.SelectSeriesRequest],
 ) (*connect.Response[querierv1.SelectSeriesResponse], error) {
+	var limit int
+	if limit = int(c.Msg.GetLimit()); limit > 0 {
+		// Limit must be applied after merging.
+		c.Msg.Limit = nil
+	}
 	return Query[querierv1.SelectSeriesRequest, querierv1.SelectSeriesResponse](ctx, r, c,
 		func(a, b *querierv1.SelectSeriesResponse) (*querierv1.SelectSeriesResponse, error) {
 			m := phlaremodel.NewTimeSeriesMerger(true)
 			m.MergeTimeSeries(a.Series)
 			m.MergeTimeSeries(b.Series)
-			return &querierv1.SelectSeriesResponse{Series: m.TimeSeries()}, nil
+			return &querierv1.SelectSeriesResponse{Series: m.Top(limit)}, nil
 		})
 }
 
diff --git a/pkg/frontend/read_path/read_path_test.go b/pkg/frontend/read_path/read_path_test.go
index cdbdf461c3..300ef63400 100644
--- a/pkg/frontend/read_path/read_path_test.go
+++ b/pkg/frontend/read_path/read_path_test.go
@@ -15,6 +15,7 @@ import (
 
 	querierv1 "github.com/grafana/pyroscope/api/gen/proto/go/querier/v1"
 	typesv1 "github.com/grafana/pyroscope/api/gen/proto/go/types/v1"
+	"github.com/grafana/pyroscope/pkg/model"
 	"github.com/grafana/pyroscope/pkg/tenant"
 	"github.com/grafana/pyroscope/pkg/test/mocks/mockquerierv1connect"
 )
@@ -193,3 +194,73 @@ func (s *routerTestSuite) Test_Series() {
 	s.Require().NoError(err)
 	s.Assert().Equal(expected, resp)
 }
+
+func (s *routerTestSuite) Test_TimeSeries_Limit() {
+	s.overrides.On("ReadPathOverrides", "tenant-a").Return(Config{
+		EnableQueryBackend:     true,
+		EnableQueryBackendFrom: time.Unix(5, 0),
+	})
+
+	one := int64(1)
+	req := connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 10, End: 10000, Limit: &one})
+	expected := connect.NewResponse(&querierv1.SelectSeriesResponse{
+		Series: []*typesv1.Series{
+			{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 3}}},
+		},
+	})
+
+	s.frontend.On("SelectSeries",
+		mock.Anything, connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 10, End: 4999})).
+		Return(connect.NewResponse(&querierv1.SelectSeriesResponse{
+			Series: []*typesv1.Series{
+				{Labels: model.LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+				{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 2}}},
+			}}), nil).Once()
+
+	s.backend.On("SelectSeries",
+		mock.Anything, connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 5000, End: 10000})).
+		Return(connect.NewResponse(&querierv1.SelectSeriesResponse{
+			Series: []*typesv1.Series{
+				{Labels: model.LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+				{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+			}}), nil).Once()
+
+	resp, err := s.router.SelectSeries(s.ctx, req)
+	s.Require().NoError(err)
+	s.Assert().Equal(expected, resp)
+}
+
+func (s *routerTestSuite) Test_TimeSeries_NoLimit() {
+	s.overrides.On("ReadPathOverrides", "tenant-a").Return(Config{
+		EnableQueryBackend:     true,
+		EnableQueryBackendFrom: time.Unix(5, 0),
+	})
+
+	req := connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 10, End: 10000})
+	expected := connect.NewResponse(&querierv1.SelectSeriesResponse{
+		Series: []*typesv1.Series{
+			{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 3}}},
+			{Labels: model.LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 2}}},
+		},
+	})
+
+	s.frontend.On("SelectSeries",
+		mock.Anything, connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 10, End: 4999})).
+		Return(connect.NewResponse(&querierv1.SelectSeriesResponse{
+			Series: []*typesv1.Series{
+				{Labels: model.LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+				{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 2}}},
+			}}), nil).Once()
+
+	s.backend.On("SelectSeries",
+		mock.Anything, connect.NewRequest(&querierv1.SelectSeriesRequest{Start: 5000, End: 10000})).
+		Return(connect.NewResponse(&querierv1.SelectSeriesResponse{
+			Series: []*typesv1.Series{
+				{Labels: model.LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+				{Labels: model.LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}}},
+			}}), nil).Once()
+
+	resp, err := s.router.SelectSeries(s.ctx, req)
+	s.Require().NoError(err)
+	s.Assert().Equal(expected, resp)
+}
diff --git a/pkg/model/time_series_merger.go b/pkg/model/time_series_merger.go
index dee074eecf..d6ffbcedfb 100644
--- a/pkg/model/time_series_merger.go
+++ b/pkg/model/time_series_merger.go
@@ -1,6 +1,8 @@
 package model
 
 import (
+	"cmp"
+	"slices"
 	"sort"
 	"sync"
 
@@ -20,6 +22,40 @@ func MergeSeries(aggregation *typesv1.TimeSeriesAggregationType, series ...[]*ty
 	return m.TimeSeries()
 }
 
+// TopSeries returns the top k series by sum of values.
+// If k is zero, all series are returned.
+// Note that even if len(c) <= k or k == 0, the returned
+// series are sorted by value in descending order and then
+// lexicographically (in ascending order).
+func TopSeries(s []*typesv1.Series, k int) []*typesv1.Series {
+	type series struct {
+		*typesv1.Series
+		sum float64
+	}
+	aggregated := make([]series, len(s))
+	for i, x := range s {
+		var sum float64
+		for _, p := range x.Points {
+			sum += p.Value
+		}
+		aggregated[i] = series{Series: x, sum: sum}
+	}
+	slices.SortFunc(aggregated, func(a, b series) int {
+		c := cmp.Compare(a.sum, b.sum)
+		if c == 0 {
+			return CompareLabelPairs(a.Labels, b.Labels)
+		}
+		return -c // Invert to sort in descending order.
+	})
+	for i, a := range aggregated {
+		s[i] = a.Series
+	}
+	if k > 0 && len(s) > k {
+		return s[:k]
+	}
+	return s
+}
+
 type TimeSeriesMerger struct {
 	mu     sync.Mutex
 	series map[uint64]*typesv1.Series
@@ -54,6 +90,14 @@ func (m *TimeSeriesMerger) IsEmpty() bool {
 }
 
 func (m *TimeSeriesMerger) TimeSeries() []*typesv1.Series {
+	r := m.mergeTimeSeries()
+	sort.Slice(r, func(i, j int) bool {
+		return CompareLabelPairs(r[i].Labels, r[j].Labels) < 0
+	})
+	return r
+}
+
+func (m *TimeSeriesMerger) mergeTimeSeries() []*typesv1.Series {
 	if len(m.series) == 0 {
 		return nil
 	}
@@ -64,12 +108,13 @@ func (m *TimeSeriesMerger) TimeSeries() []*typesv1.Series {
 		r[i] = s
 		i++
 	}
-	sort.Slice(r, func(i, j int) bool {
-		return CompareLabelPairs(r[i].Labels, r[j].Labels) < 0
-	})
 	return r
 }
 
+func (m *TimeSeriesMerger) Top(n int) []*typesv1.Series {
+	return TopSeries(m.mergeTimeSeries(), n)
+}
+
 func (m *TimeSeriesMerger) mergePoints(points []*typesv1.Point) int {
 	l := len(points)
 	if l < 2 {
diff --git a/pkg/model/time_series_merger_test.go b/pkg/model/time_series_merger_test.go
index f947942cd0..ced28c66a0 100644
--- a/pkg/model/time_series_merger_test.go
+++ b/pkg/model/time_series_merger_test.go
@@ -85,3 +85,111 @@ func Test_SeriesMerger_Overlap_Sum(t *testing.T) {
 		})
 	}
 }
+
+func Test_SeriesMerger_Top(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		in   [][]*typesv1.Series
+		out  []*typesv1.Series
+		top  int
+	}{
+		{
+			name: "top == len",
+			in: [][]*typesv1.Series{
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+				},
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+				},
+			},
+			top: 2,
+			out: []*typesv1.Series{
+				{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 2}, {Timestamp: 3, Value: 2}}},
+				{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 2}, {Timestamp: 3, Value: 1}}},
+			},
+		},
+		{
+			name: "top < len",
+			in: [][]*typesv1.Series{
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+				},
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+				},
+			},
+			top: 1,
+			out: []*typesv1.Series{
+				{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 2}, {Timestamp: 3, Value: 2}}},
+			},
+		},
+		{
+			name: "top > len",
+			in: [][]*typesv1.Series{
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+				},
+				{
+					{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+				},
+			},
+			top: 3,
+			out: []*typesv1.Series{
+				{Labels: LabelsFromStrings("foo", "baz"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 2}, {Timestamp: 3, Value: 2}}},
+				{Labels: LabelsFromStrings("foo", "bar"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 2}, {Timestamp: 3, Value: 1}}},
+			},
+		},
+		{
+			name: "order",
+			in: [][]*typesv1.Series{
+				{
+					{Labels: LabelsFromStrings("foo", "d"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "e"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "c"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "a"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+					{Labels: LabelsFromStrings("foo", "b"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 3}}},
+				},
+			},
+			top: 4,
+			out: []*typesv1.Series{
+				{Labels: LabelsFromStrings("foo", "b"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 3}}},
+				{Labels: LabelsFromStrings("foo", "a"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+				{Labels: LabelsFromStrings("foo", "c"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+				{Labels: LabelsFromStrings("foo", "d"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+			},
+		},
+		{
+			name: "k == 0",
+			in: [][]*typesv1.Series{
+				{
+					{Labels: LabelsFromStrings("foo", "d"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "c"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+					{Labels: LabelsFromStrings("foo", "a"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+					{Labels: LabelsFromStrings("foo", "b"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 3}}},
+				},
+			},
+			top: 0,
+			out: []*typesv1.Series{
+				{Labels: LabelsFromStrings("foo", "b"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 3}}},
+				{Labels: LabelsFromStrings("foo", "a"), Points: []*typesv1.Point{{Timestamp: 2, Value: 1}, {Timestamp: 3, Value: 2}}},
+				{Labels: LabelsFromStrings("foo", "c"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+				{Labels: LabelsFromStrings("foo", "d"), Points: []*typesv1.Point{{Timestamp: 1, Value: 1}, {Timestamp: 2, Value: 1}}},
+			},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			m := NewTimeSeriesMerger(true)
+			for _, s := range tc.in {
+				m.MergeTimeSeries(s)
+			}
+			testhelper.EqualProto(t, tc.out, m.Top(tc.top))
+		})
+	}
+}