diff --git a/lib/benchee/formatters/tagged_save.ex b/lib/benchee/formatters/tagged_save.ex
index a65c92a3..2c5fe0ea 100644
--- a/lib/benchee/formatters/tagged_save.ex
+++ b/lib/benchee/formatters/tagged_save.ex
@@ -14,26 +14,56 @@ defmodule Benchee.Formatters.TaggedSave do
   alias Benchee.Benchmark.Scenario
   alias Benchee.Utility.FileCreation
 
-  @spec format(Suite.t) :: {binary, String.t}
+  @spec format(Suite.t()) :: {binary, String.t()}
   def format(suite = %Suite{configuration: config, scenarios: scenarios}) do
     formatter_config = config.formatter_options.tagged_save
-    tagged_scenarios = tag_scenarios(scenarios, formatter_config)
+    tag = determine_tag(scenarios, formatter_config)
+    tagged_scenarios = tag_scenarios(scenarios, tag)
     tagged_suite = %Suite{suite | scenarios: tagged_scenarios}
 
     {:erlang.term_to_binary(tagged_suite), formatter_config.path}
   end
 
-  defp tag_scenarios(scenarios, %{tag: tag}) do
-    Enum.map scenarios, fn(scenario) ->
+  defp determine_tag(scenarios, %{tag: desired_tag}) do
+    scenarios
+    |> Enum.map(fn scenario -> scenario.tag end)
+    |> Enum.uniq()
+    |> Enum.filter(fn tag ->
+      tag != nil && tag =~ ~r/#{Regex.escape(desired_tag)}/
+    end)
+    |> choose_tag(desired_tag)
+  end
+
+  defp choose_tag([], desired_tag), do: desired_tag
+
+  defp choose_tag(tags, desired_tag) do
+    if Enum.all?(tags, fn tag -> tag == desired_tag end) do
+      "#{desired_tag}-2"
+    else
+      max = get_maximum_tag_increaser(tags, desired_tag)
+      "#{desired_tag}-#{max + 1}"
+    end
+  end
+
+  defp get_maximum_tag_increaser(tags, desired_tag) do
+    tags
+    |> Enum.map(fn tag -> String.replace(tag, desired_tag <> "-", "") end)
+    |> Enum.map(&String.to_integer/1)
+    |> Enum.max()
+  end
+
+  defp tag_scenarios(scenarios, tag) do
+    Enum.map(scenarios, fn scenario ->
       scenario
       |> tagged_scenario(tag)
       |> update_name
-    end
+    end)
   end
 
   defp tagged_scenario(scenario = %Scenario{tag: nil}, desired_tag) do
     %Scenario{scenario | tag: desired_tag}
   end
+
   defp tagged_scenario(scenario, _desired_tag) do
     scenario
   end
@@ -42,12 +72,12 @@ defmodule Benchee.Formatters.TaggedSave do
     %Scenario{scenario | name: Scenario.display_name(scenario)}
   end
 
-  @spec write({binary, String.t}) :: :ok
+  @spec write({binary, String.t()}) :: :ok
   def write({term_binary, filename}) do
     FileCreation.ensure_directory_exists(filename)
     return_value = File.write(filename, term_binary)
 
-    IO.puts "Suite saved in external term format at #{filename}"
+    IO.puts("Suite saved in external term format at #{filename}")
 
     return_value
   end
diff --git a/test/benchee/formatters/tagged_save_test.exs b/test/benchee/formatters/tagged_save_test.exs
index c243cfb1..de3d0dbc 100644
--- a/test/benchee/formatters/tagged_save_test.exs
+++ b/test/benchee/formatters/tagged_save_test.exs
@@ -31,12 +31,12 @@ defmodule Benchee.Formatters.TaggedSaveTest do
         input_name: no_input(),
         input: no_input(),
         run_time_statistics: %Statistics{
-           average: 100.0,
-           ips: 10_000.0,
-           std_dev_ratio: 0.1,
-           median: 90.0,
-           percentiles: %{99 => 300.1}
-         }
+          average: 100.0,
+          ips: 10_000.0,
+          std_dev_ratio: 0.1,
+          median: 90.0,
+          percentiles: %{99 => 300.1}
+        }
       }
     ],
     configuration: %Benchee.Configuration{
@@ -53,9 +53,10 @@ defmodule Benchee.Formatters.TaggedSaveTest do
     test "able to restore the original just fine" do
       {binary, path} = format(@suite)
 
-      loaded_suite = binary
-                     |> :erlang.binary_to_term
-                     |> suite_without_scenario_tags
+      loaded_suite =
+        binary
+        |> :erlang.binary_to_term()
+        |> suite_without_scenario_tags
 
       assert loaded_suite == @suite
       assert path == @filename
@@ -66,38 +67,85 @@ defmodule Benchee.Formatters.TaggedSaveTest do
 
       loaded_suite = :erlang.binary_to_term(binary)
 
-      Enum.each loaded_suite.scenarios, fn(scenario) ->
+      Enum.each(loaded_suite.scenarios, fn scenario ->
         assert scenario.tag == @benchee_tag
         assert scenario.name =~ ~r/#{@benchee_tag}/
-      end
+      end)
     end
 
-    test "doesn't tag scenarios that already had a tag" do
+    test "doesn't tag scenarios that already have a tag" do
       tagged_scenario = %Scenario{tag: "some-tag"}
       suite = %Suite{@suite | scenarios: [tagged_scenario | @suite.scenarios]}
 
+      tags =
+        suite
+        |> scenarios_from_formatted
+        |> sorted_tags
+
+      assert tags == [@benchee_tag, "some-tag"]
+    end
+
+    test "when duplicating tags for the same job the second gets -2" do
+      tagged_scenario = %Scenario{job_name: "foo", tag: @benchee_tag}
+      scenario = %Scenario{job_name: "foo"}
+      suite = %Suite{@suite | scenarios: [scenario, tagged_scenario]}
+
+      scenarios = scenarios_from_formatted(suite)
+      tags = sorted_tags(scenarios)
+      names = sorted_names(scenarios)
+
+      assert tags == [@benchee_tag, @benchee_tag <> "-2"]
+      assert names == ["foo (#{@benchee_tag})", "foo (#{@benchee_tag}-2)"]
+    end
+
+    test "when there's already a -2 and -3 tag we end up with -4" do
+      scenario_1 = %Scenario{job_name: "foo", tag: "#{@benchee_tag}-2"}
+      scenario_2 = %Scenario{job_name: "foo", tag: "#{@benchee_tag}-3"}
+      new_scenario = %Scenario{job_name: "foo"}
+
+      suite = %Suite{@suite | scenarios: [scenario_1, new_scenario, scenario_2]}
+
+      scenarios = scenarios_from_formatted(suite)
+      tags = sorted_tags(scenarios)
+      names = sorted_names(scenarios)
+
+      assert tags == [@benchee_tag <> "-2", @benchee_tag <> "-3", @benchee_tag <> "-4"]
+
+      assert names ==
+               ["foo (#{@benchee_tag}-2)", "foo (#{@benchee_tag}-3)", "foo (#{@benchee_tag}-4)"]
+    end
+
+    defp scenarios_from_formatted(suite) do
       {binary, _path} = format(suite)
       loaded_suite = :erlang.binary_to_term(binary)
-      loaded_scenarios = loaded_suite.scenarios
+      loaded_suite.scenarios
+    end
 
-      tags = loaded_scenarios
-             |> Enum.map(fn(scenario) -> scenario.tag end)
-             |> Enum.uniq
-             |> Enum.sort
+    defp sorted_tags(scenarios) do
+      scenarios
+      |> Enum.map(fn scenario -> scenario.tag end)
+      |> Enum.uniq()
+      |> Enum.sort()
+    end
 
-      assert tags == [@benchee_tag, "some-tag"]
+    defp sorted_names(scenarios) do
+      scenarios
+      |> Enum.map(fn scenario -> scenario.name end)
+      |> Enum.uniq()
+      |> Enum.sort()
     end
   end
 
   describe ".output/1" do
     test "able to restore fully from file" do
-      capture_io fn -> output(@suite) end
+      capture_io(fn -> output(@suite) end)
 
       etf_data = File.read!(@filename)
 
-      loaded_suite = etf_data
-                     |> :erlang.binary_to_term
-                     |> suite_without_scenario_tags
+      loaded_suite =
+        etf_data
+        |> :erlang.binary_to_term()
+        |> suite_without_scenario_tags
 
       assert loaded_suite == @suite
     after