diff --git a/app/interactors/add_playoffs_to_tournament.rb b/app/interactors/add_playoffs_to_tournament.rb
index 9efc2ec..59753b0 100644
--- a/app/interactors/add_playoffs_to_tournament.rb
+++ b/app/interactors/add_playoffs_to_tournament.rb
@@ -12,7 +12,8 @@ class AddPlayoffsToTournament
       else
         tournament.stages.concat playoff_stages
       end
-      context.object_to_save = tournament
+      context.intermediate_stage = tournament.stages.find(&:intermediate_stage?)
+      context.object_to_save = [tournament]
     else
       context.fail!
     end
diff --git a/app/interactors/advance_teams_in_intermediate_stage.rb b/app/interactors/advance_teams_in_intermediate_stage.rb
new file mode 100644
index 0000000..cf060b6
--- /dev/null
+++ b/app/interactors/advance_teams_in_intermediate_stage.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class AdvanceTeamsInIntermediateStage
+  include Interactor
+
+  def call
+    intermediate_stage = context.intermediate_stage
+    return if intermediate_stage.nil?
+
+    intermediate_stage.matches.select { |m| m.state == 'single_team' }
+                      .each { |match| PopulateMatchBelowAndSave.call(match: match) }
+    context.object_to_save << intermediate_stage
+  end
+end
diff --git a/app/organizers/add_playoffs_to_tournament_and_save.rb b/app/organizers/add_playoffs_to_tournament_and_save.rb
index 766add6..e2e5c49 100644
--- a/app/organizers/add_playoffs_to_tournament_and_save.rb
+++ b/app/organizers/add_playoffs_to_tournament_and_save.rb
@@ -3,5 +3,5 @@
 class AddPlayoffsToTournamentAndSave
   include Interactor::Organizer
 
-  organize AddPlayoffsToTournament, SaveApplicationRecordObject
+  organize AddPlayoffsToTournament, AdvanceTeamsInIntermediateStage, SaveApplicationRecordObject
 end
diff --git a/spec/interactors/advance_teams_in_intermediate_stage_interactor_spec.rb b/spec/interactors/advance_teams_in_intermediate_stage_interactor_spec.rb
new file mode 100644
index 0000000..cdb13ce
--- /dev/null
+++ b/spec/interactors/advance_teams_in_intermediate_stage_interactor_spec.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+RSpec.describe AdvanceTeamsInIntermediateStage do
+  context 'intermediate_stage is nil' do
+    let(:context) do
+      AdvanceTeamsInIntermediateStage.call(intermediate_stage: nil)
+    end
+
+    it 'succeeds' do
+      expect(context).to be_a_success
+    end
+
+    it 'doesn\'t call PopulateMatchBelow' do
+      expect(PopulateMatchBelowAndSave).not_to receive(:call)
+      context
+    end
+  end
+end