diff --git a/app/channels/tournament_matches_channel.rb b/app/channels/tournament_matches_channel.rb
index 4e2e78f..954a988 100644
--- a/app/channels/tournament_matches_channel.rb
+++ b/app/channels/tournament_matches_channel.rb
@@ -2,10 +2,28 @@
 
 class TournamentMatchesChannel < ApplicationCable::Channel
   def subscribed
-    tournament = Tournament.find(params[:tournament_id])
-    state = params[:state].presence
+    @tournament_id = params[:tournament_id]
+    @filters = match_filters
+    tournament = Tournament.find(@tournament_id)
 
-    stream_for TournamentMatchesBroadcast.stream_target(tournament, state:)
-    transmit TournamentMatchesBroadcastPayload.build(tournament, state:)
+    stream_for TournamentMatchesBroadcast.stream_target(tournament) do
+      transmit_current_payload
+    end
+    transmit TournamentMatchesBroadcastPayload.build(tournament, @filters)
+  end
+
+  private
+
+  attr_reader :tournament_id, :filters
+
+  def match_filters
+    params.slice(:state, :stage_id, :stage_level, :position, :group_stage_position)
+  end
+
+  def transmit_current_payload
+    tournament = TournamentMatchesBroadcast.load_tournament(tournament_id)
+    return if tournament.nil?
+
+    transmit TournamentMatchesBroadcastPayload.build(tournament, filters)
   end
 end
diff --git a/app/controllers/matches_controller.rb b/app/controllers/matches_controller.rb
index 929e889..a2cdb01 100644
--- a/app/controllers/matches_controller.rb
+++ b/app/controllers/matches_controller.rb
@@ -13,7 +13,7 @@ class MatchesController < ApplicationController
 
   # GET/tournaments/1/matches
   def index
-    render json: TournamentMatchesPayload.build(@tournament, state: match_params['state'])
+    render json: TournamentMatchesPayload.build(@tournament, match_index_params)
   end
 
   # GET /matches/1
@@ -149,6 +149,10 @@ class MatchesController < ApplicationController
     params.slice(:state).permit!
   end
 
+  def match_index_params
+    params.slice(:state, :stage_id, :stage_level, :position, :group_stage_position).permit!
+  end
+
   def create_match_params
     params.slice(:team_ids).permit(team_ids: [])
   end
diff --git a/app/services/tournament_matches_broadcast.rb b/app/services/tournament_matches_broadcast.rb
index 792ebd3..7c2727b 100644
--- a/app/services/tournament_matches_broadcast.rb
+++ b/app/services/tournament_matches_broadcast.rb
@@ -1,27 +1,21 @@
 # frozen_string_literal: true
 
 class TournamentMatchesBroadcast
-  STATES = [nil, 'upcoming', *Match.states.keys].freeze
-
   class << self
     def call(tournament_id)
       tournament = load_tournament(tournament_id)
       return if tournament.nil?
 
-      STATES.each do |state|
-        TournamentMatchesChannel.broadcast_to(
-          stream_target(tournament, state:),
-          TournamentMatchesBroadcastPayload.build(tournament, state:)
-        )
-      end
+      TournamentMatchesChannel.broadcast_to(
+        stream_target(tournament),
+        { type: 'tournament_matches.changed', tournament_id: tournament.id }
+      )
     end
 
-    def stream_target(tournament, state:)
-      "#{tournament.to_gid_param}:matches:#{state.presence || 'all'}"
+    def stream_target(tournament)
+      "#{tournament.to_gid_param}:matches"
     end
 
-    private
-
     def load_tournament(tournament_id)
       Tournament.includes(
         stages: [
diff --git a/app/services/tournament_matches_broadcast_payload.rb b/app/services/tournament_matches_broadcast_payload.rb
index 1e044ed..ebb9d5f 100644
--- a/app/services/tournament_matches_broadcast_payload.rb
+++ b/app/services/tournament_matches_broadcast_payload.rb
@@ -2,12 +2,13 @@
 
 class TournamentMatchesBroadcastPayload
   class << self
-    def build(tournament, state: nil)
+    def build(tournament, filters = {}, state: nil)
+      filters = TournamentMatchesPayload.normalize_filters(filters, state:)
       {
         type: 'tournament_matches.updated',
         tournament_id: tournament.id,
-        state:,
-        matches: TournamentMatchesPayload.build(tournament, state:)
+        state: filters[:state],
+        matches: TournamentMatchesPayload.build(tournament, filters)
       }
     end
   end
diff --git a/app/services/tournament_matches_payload.rb b/app/services/tournament_matches_payload.rb
index c3e679c..dea06cc 100644
--- a/app/services/tournament_matches_payload.rb
+++ b/app/services/tournament_matches_payload.rb
@@ -2,18 +2,77 @@
 
 class TournamentMatchesPayload
   class << self
-    def build(tournament, state: nil)
-      serialized_matches(matches_for(tournament, state:))
+    def build(tournament, filters = {}, state: nil, **filter_keywords)
+      serialized_matches(matches_for(tournament, filters.merge(filter_keywords), state:))
     end
 
-    def matches_for(tournament, state: nil)
+    def matches_for(tournament, filters = {}, state: nil, **filter_keywords)
+      filters = normalize_filters(filters.merge(filter_keywords), state:)
+      matches = state_filtered_matches(tournament, filters[:state])
+
+      matches.select { |match| match_matches_filters?(match, filters) }
+    end
+
+    def normalize_filters(filters = {}, state: nil)
+      raw_filters = filters.to_h.with_indifferent_access
+      raw_filters[:state] = state unless state.nil?
+
+      {
+        state: raw_filters[:state].presence,
+        stage_id: integer_filter(raw_filters[:stage_id]),
+        stage_level: integer_filter(raw_filters[:stage_level]),
+        position: integer_filter(raw_filters[:position]),
+        group_stage_position: integer_filter(raw_filters[:group_stage_position])
+      }.compact
+    end
+
+    private
+
+    def state_filtered_matches(tournament, state)
       return tournament.matches if state.blank?
       return upcoming_matches_for(tournament) if state == 'upcoming'
 
       tournament.matches.select { |match| match.state == state }
     end
 
-    private
+    def match_matches_filters?(match, filters)
+      stage = match_stage(match)
+
+      stage_id_matches?(stage, filters) &&
+        stage_level_matches?(stage, filters) &&
+        position_matches?(match, filters) &&
+        group_stage_position_matches?(match, stage, filters)
+    end
+
+    def match_stage(match)
+      match.stage || match.group&.stage
+    end
+
+    def stage_id_matches?(stage, filters)
+      filters[:stage_id].nil? || stage&.id == filters[:stage_id]
+    end
+
+    def stage_level_matches?(stage, filters)
+      filters[:stage_level].nil? || stage&.level == filters[:stage_level]
+    end
+
+    def position_matches?(match, filters)
+      filters[:position].nil? || match.position == filters[:position]
+    end
+
+    def group_stage_position_matches?(match, stage, filters)
+      filters[:group_stage_position].nil? ||
+        (match.group_match? && stage&.level == -1 && match.position == filters[:group_stage_position])
+    end
+
+    def integer_filter(value)
+      return nil if value.blank?
+      return value if value.is_a?(Integer)
+
+      Integer(value, 10)
+    rescue ArgumentError, TypeError
+      :invalid
+    end
 
     def upcoming_matches_for(tournament)
       upcoming_group_matches(tournament).presence || upcoming_playoff_matches(tournament)
diff --git a/e2e/lib/action_cable_client.rb b/e2e/lib/action_cable_client.rb
index bc8f21d..47a7be0 100644
--- a/e2e/lib/action_cable_client.rb
+++ b/e2e/lib/action_cable_client.rb
@@ -61,11 +61,15 @@ module TurniereE2E
       end
     end
 
-    def subscribe_matches!(tournament_id:, state: nil)
+    def subscribe_matches!(tournament_id:, **filters)
       identifier = {
         channel: 'TournamentMatchesChannel',
         tournament_id:,
-        state:
+        state: filters[:state],
+        stage_id: filters[:stage_id],
+        stage_level: filters[:stage_level],
+        position: filters[:position],
+        group_stage_position: filters[:group_stage_position]
       }.compact.to_json
 
       subscribe!(identifier:) do |message|
diff --git a/spec/controllers/matches_controller_spec.rb b/spec/controllers/matches_controller_spec.rb
index b7429a4..099f5b0 100644
--- a/spec/controllers/matches_controller_spec.rb
+++ b/spec/controllers/matches_controller_spec.rb
@@ -50,6 +50,27 @@ RSpec.describe MatchesController, type: :controller do
         expect(match.keys).to match_array(%i[id position state teams match_scores group stage])
         expect(match[:teams]).to all(include(:id, :name))
       end
+
+      it 'filters group stage matches by position across groups' do
+        get :index, params: { tournament_id: @tournament.to_param, group_stage_position: 0 }
+        body = deserialize_response(response)
+
+        expect(body).not_to be_empty
+        expect(body).to all(include(position: 0))
+        expect(body.map { |match| match.dig(:stage, :level) }.uniq).to eq([-1])
+      end
+    end
+
+    context 'on a playoff tournament' do
+      it 'filters matches by stage level' do
+        stage = @tournament.stages.find_by!(level: 1)
+
+        get :index, params: { tournament_id: @tournament.to_param, stage_level: stage.level }
+        body = deserialize_response(response)
+
+        expect(body.map { |match| match.dig(:stage, :level) }.uniq).to eq([stage.level])
+        expect(body.map { |match| match[:id] }).to match_array(stage.matches.map(&:id))
+      end
     end
     # TODO add test for upcoming once there is test data for a "valid" group stage
   end
diff --git a/spec/e2e/http/api_surface_spec.rb b/spec/e2e/http/api_surface_spec.rb
index aebfcaf..a235632 100644
--- a/spec/e2e/http/api_surface_spec.rb
+++ b/spec/e2e/http/api_surface_spec.rb
@@ -203,6 +203,14 @@ RSpec.describe 'Backend API surface HTTP E2E' do
     matches_all = anonymous_client.get("/tournaments/#{tournament.fetch(:id)}/matches")
     matches_not_started = anonymous_client.get("/tournaments/#{tournament.fetch(:id)}/matches", params: { state: 'not_started' })
     matches_upcoming = anonymous_client.get("/tournaments/#{tournament.fetch(:id)}/matches", params: { state: 'upcoming' })
+    matches_group_position = anonymous_client.get(
+      "/tournaments/#{tournament.fetch(:id)}/matches",
+      params: { group_stage_position: match.fetch(:position) }
+    )
+    matches_group_stage = anonymous_client.get(
+      "/tournaments/#{tournament.fetch(:id)}/matches",
+      params: { stage_level: group_stage.fetch(:level) }
+    )
     match_show = anonymous_client.get("/matches/#{match.fetch(:id)}")
     invalid_match_update = owner_client.patch("/matches/#{match.fetch(:id)}", body: { state: 'bogus' })
     forbidden_match_update = other_client.patch("/matches/#{match.fetch(:id)}", body: { state: 'in_progress' })
@@ -271,6 +279,12 @@ RSpec.describe 'Backend API surface HTTP E2E' do
     expect(matches_not_started[:json].map { |item| item[:id] }).to include(match.fetch(:id))
     expect(matches_upcoming[:status]).to eq(200)
     expect(matches_upcoming[:json].map { |item| item[:id] }).to include(match.fetch(:id))
+    expect(matches_group_position[:status]).to eq(200)
+    expect(matches_group_position[:json].map { |item| item.dig(:stage, :level) }.uniq).to eq([-1])
+    expect(matches_group_position[:json]).to all(include(position: match.fetch(:position)))
+    expect(matches_group_stage[:status]).to eq(200)
+    expect(matches_group_stage[:json].count).to eq(tournament_match_count(tournament))
+    expect(matches_group_stage[:json].map { |item| item.dig(:stage, :id) }.uniq).to eq([group_stage.fetch(:id)])
     expect(match_show[:status]).to eq(200)
     expect(invalid_match_update[:status]).to eq(422)
     expect(invalid_match_update.dig(:json, :error)).to eq('Invalid target state')
diff --git a/spec/e2e/http/tournament_live_websocket_spec.rb b/spec/e2e/http/tournament_live_websocket_spec.rb
index bb3fe2a..8f18233 100644
--- a/spec/e2e/http/tournament_live_websocket_spec.rb
+++ b/spec/e2e/http/tournament_live_websocket_spec.rb
@@ -29,8 +29,20 @@ RSpec.describe 'Tournament live websocket HTTP E2E' do
 
     tournament_cable = TurniereE2E::ActionCableClient.new(base_url:)
     matches_cable = TurniereE2E::ActionCableClient.new(base_url:)
+    filtered_matches_cable = TurniereE2E::ActionCableClient.new(base_url:)
+    stage_matches_cable = TurniereE2E::ActionCableClient.new(base_url:)
+    group_position_filter = { group_stage_position: match.fetch(:position) }
+    stage_filter = { stage_level: group_stage.fetch(:level) }
     tournament_cable.subscribe_tournament!(tournament_id: tournament.fetch(:id))
     matches_cable.subscribe_matches!(tournament_id: tournament.fetch(:id))
+    filtered_matches_cable.subscribe_matches!(
+      tournament_id: tournament.fetch(:id),
+      **group_position_filter
+    )
+    stage_matches_cable.subscribe_matches!(
+      tournament_id: tournament.fetch(:id),
+      **stage_filter
+    )
 
     expect(tournament_cable.wait_for_tournament_payload!.fetch('tournament')).to(
       eq(json_for_api(fetch_tournament(tournament.fetch(:id))))
@@ -38,6 +50,12 @@ RSpec.describe 'Tournament live websocket HTTP E2E' do
     expect(matches_cable.wait_for_matches_payload!.fetch('matches')).to(
       eq(json_for_api(fetch_matches(tournament.fetch(:id))))
     )
+    expect(filtered_matches_cable.wait_for_matches_payload!.fetch('matches')).to(
+      eq(json_for_api(fetch_matches(tournament.fetch(:id), params: group_position_filter)))
+    )
+    expect(stage_matches_cable.wait_for_matches_payload!.fetch('matches')).to(
+      eq(json_for_api(fetch_matches(tournament.fetch(:id), params: stage_filter)))
+    )
 
     play_match!(match.fetch(:id), first_score: 3, second_score: 1)
 
@@ -55,9 +73,29 @@ RSpec.describe 'Tournament live websocket HTTP E2E' do
 
     matches_payload = wait_for_matches_payload!(matches_cable, match_id: match.fetch(:id), state: 'finished')
     expect(matches_payload.fetch('matches')).to eq(json_for_api(fetch_matches(tournament.fetch(:id))))
+
+    filtered_matches_payload = wait_for_matches_payload!(
+      filtered_matches_cable,
+      match_id: match.fetch(:id),
+      state: 'finished'
+    )
+    expect(filtered_matches_payload.fetch('matches')).to(
+      eq(json_for_api(fetch_matches(tournament.fetch(:id), params: group_position_filter)))
+    )
+
+    stage_matches_payload = wait_for_matches_payload!(
+      stage_matches_cable,
+      match_id: match.fetch(:id),
+      state: 'finished'
+    )
+    expect(stage_matches_payload.fetch('matches')).to(
+      eq(json_for_api(fetch_matches(tournament.fetch(:id), params: stage_filter)))
+    )
   ensure
     tournament_cable&.close
     matches_cable&.close
+    filtered_matches_cable&.close
+    stage_matches_cable&.close
   end
 
   def login_client
@@ -111,8 +149,8 @@ RSpec.describe 'Tournament live websocket HTTP E2E' do
     response.fetch(:json)
   end
 
-  def fetch_matches(tournament_id)
-    response = TurniereE2E::ApiClient.new(base_url:).get("/tournaments/#{tournament_id}/matches")
+  def fetch_matches(tournament_id, params: {})
+    response = TurniereE2E::ApiClient.new(base_url:).get("/tournaments/#{tournament_id}/matches", params:)
     expect(response[:status]).to eq(200)
     response.fetch(:json)
   end
diff --git a/spec/services/tournament_live_payload_spec.rb b/spec/services/tournament_live_payload_spec.rb
index 3d3502e..cd91ab4 100644
--- a/spec/services/tournament_live_payload_spec.rb
+++ b/spec/services/tournament_live_payload_spec.rb
@@ -34,6 +34,29 @@ RSpec.describe 'Tournament live payloads' do
       expect(serialized_match[:teams].map { |team| team[:id] }).to match_array(match.teams.map(&:id))
       expect(serialized_match[:match_scores].map { |score| score[:team][:id] }).to match_array(match.teams.map(&:id))
     end
+
+    it 'filters group stage matches by position across groups' do
+      tournament = create(:group_stage_tournament, group_count: 2, match_factory: :filled_group_match)
+      tournament.group_stage.groups.each do |group|
+        group.matches.each_with_index { |match, index| match.update!(position: index) }
+      end
+
+      matches = described_class.matches_for(tournament, group_stage_position: 0)
+
+      expect(matches).to all(be_group_match)
+      expect(matches.map(&:position).uniq).to eq([0])
+      expect(matches.map { |match| match.group.stage.level }.uniq).to eq([-1])
+      expect(matches.map(&:group_id)).to match_array(tournament.group_stage.groups.map(&:id))
+    end
+
+    it 'filters all matches belonging to a stage level' do
+      tournament = create(:stage_tournament, stage_count: 2)
+      stage = tournament.stages.find_by!(level: 1)
+
+      matches = described_class.matches_for(tournament, stage_level: stage.level)
+
+      expect(matches).to match_array(stage.matches)
+    end
   end
 
   describe TournamentBroadcastPayload do