diff --git a/tools/internal_ci/linux/grpc_master.cfg b/tools/internal_ci/macos/grpc_basictests.cfg
similarity index 83%
rename from tools/internal_ci/linux/grpc_master.cfg
rename to tools/internal_ci/macos/grpc_basictests.cfg
index a2784df2974..ce3609c9ec4 100644
--- a/tools/internal_ci/linux/grpc_master.cfg
+++ b/tools/internal_ci/macos/grpc_basictests.cfg
@@ -15,7 +15,7 @@
 # Config file for the internal CI (in protobuf text format)
 
 # Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/linux/grpc_run_tests_matrix.sh"
+build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 timeout_mins: 240
 action {
   define_artifacts {
@@ -26,5 +26,5 @@ action {
 
 env_vars {
   key: "RUN_TESTS_FLAGS"
-  value: "-f basictests linux --inner_jobs 16 -j 1 --internal_ci --bq_result_table aggregate_results"
+  value: "-f basictests macos --internal_ci -j 2 --inner_jobs 4"
 }
diff --git a/tools/internal_ci/macos/grpc_master.cfg b/tools/internal_ci/macos/grpc_master.cfg
index 24c021dfcc2..ce3609c9ec4 100644
--- a/tools/internal_ci/macos/grpc_master.cfg
+++ b/tools/internal_ci/macos/grpc_master.cfg
@@ -15,7 +15,7 @@
 # Config file for the internal CI (in protobuf text format)
 
 # Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/macos/grpc_master.sh"
+build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 timeout_mins: 240
 action {
   define_artifacts {
@@ -23,3 +23,8 @@ action {
     regex: "github/grpc/reports/**"
   }
 }
+
+env_vars {
+  key: "RUN_TESTS_FLAGS"
+  value: "-f basictests macos --internal_ci -j 2 --inner_jobs 4"
+}
diff --git a/tools/internal_ci/macos/grpc_master.sh b/tools/internal_ci/macos/grpc_run_tests_matrix.sh
similarity index 89%
rename from tools/internal_ci/macos/grpc_master.sh
rename to tools/internal_ci/macos/grpc_run_tests_matrix.sh
index c64666b2dec..9a43e4869b0 100755
--- a/tools/internal_ci/macos/grpc_master.sh
+++ b/tools/internal_ci/macos/grpc_run_tests_matrix.sh
@@ -20,7 +20,7 @@ cd $(dirname $0)/../../..
 
 source tools/internal_ci/helper_scripts/prepare_build_macos_rc
 
-tools/run_tests/run_tests_matrix.py -f basictests macos --internal_ci -j 2 --inner_jobs 4 || FAILED="true"
+tools/run_tests/run_tests_matrix.py $RUN_TESTS_FLAGS || FAILED="true"
 
 # kill port_server.py to prevent the build from hanging
 ps aux | grep port_server\\.py | awk '{print $2}' | xargs kill -9
diff --git a/tools/internal_ci/windows/grpc_basictests.cfg b/tools/internal_ci/windows/grpc_basictests.cfg
new file mode 100644
index 00000000000..a116738651f
--- /dev/null
+++ b/tools/internal_ci/windows/grpc_basictests.cfg
@@ -0,0 +1,30 @@
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Config file for the internal CI (in protobuf text format)
+
+# Location of the continuous shell script in repository.
+build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
+timeout_mins: 360
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+    regex: "github/grpc/reports/**"
+  }
+}
+
+env_vars {
+  key: "RUN_TESTS_FLAGS"
+  value: "-f basictests windows -j 1 --inner_jobs 8 --internal_ci"
+}
diff --git a/tools/internal_ci/windows/grpc_master.cfg b/tools/internal_ci/windows/grpc_master.cfg
index 786ebc01973..a116738651f 100644
--- a/tools/internal_ci/windows/grpc_master.cfg
+++ b/tools/internal_ci/windows/grpc_master.cfg
@@ -15,7 +15,7 @@
 # Config file for the internal CI (in protobuf text format)
 
 # Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/windows/grpc_master.bat"
+build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
 timeout_mins: 360
 action {
   define_artifacts {
@@ -23,3 +23,8 @@ action {
     regex: "github/grpc/reports/**"
   }
 }
+
+env_vars {
+  key: "RUN_TESTS_FLAGS"
+  value: "-f basictests windows -j 1 --inner_jobs 8 --internal_ci"
+}
diff --git a/tools/internal_ci/windows/grpc_portability_master.bat b/tools/internal_ci/windows/grpc_portability_master.bat
deleted file mode 100644
index c93d56c7e4a..00000000000
--- a/tools/internal_ci/windows/grpc_portability_master.bat
+++ /dev/null
@@ -1,24 +0,0 @@
-@rem Copyright 2017 gRPC authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem     http://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-
-@rem enter repo root
-cd /d %~dp0\..\..\..
-
-call tools/internal_ci/helper_scripts/prepare_build_windows.bat
-
-python tools/run_tests/run_tests_matrix.py -f portability windows -j 1 --inner_jobs 8 --internal_ci || goto :error
-goto :EOF
-
-:error
-exit /b %errorlevel%
diff --git a/tools/internal_ci/windows/grpc_portability_master.cfg b/tools/internal_ci/windows/grpc_portability_master.cfg
index 85f69272546..c395cb4a949 100644
--- a/tools/internal_ci/windows/grpc_portability_master.cfg
+++ b/tools/internal_ci/windows/grpc_portability_master.cfg
@@ -15,7 +15,7 @@
 # Config file for the internal CI (in protobuf text format)
 
 # Location of the continuous shell script in repository.
-build_file: "grpc/tools/internal_ci/windows/grpc_portability_master.bat"
+build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
 timeout_mins: 360
 action {
   define_artifacts {
@@ -23,3 +23,8 @@ action {
     regex: "github/grpc/reports/**"
   }
 }
+
+env_vars {
+  key: "RUN_TESTS_FLAGS"
+  value: "-f portability windows -j 1 --inner_jobs 8 --internal_ci"
+}
diff --git a/tools/internal_ci/windows/grpc_master.bat b/tools/internal_ci/windows/grpc_run_tests_matrix.bat
similarity index 87%
rename from tools/internal_ci/windows/grpc_master.bat
rename to tools/internal_ci/windows/grpc_run_tests_matrix.bat
index 58eefc301bb..08d834f8b06 100644
--- a/tools/internal_ci/windows/grpc_master.bat
+++ b/tools/internal_ci/windows/grpc_run_tests_matrix.bat
@@ -17,7 +17,7 @@ cd /d %~dp0\..\..\..
 
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat
 
-python tools/run_tests/run_tests_matrix.py -f basictests windows -j 1 --inner_jobs 8 --internal_ci || goto :error
+python tools/run_tests/run_tests_matrix.py %RUN_TESTS_FLAGS% || goto :error
 goto :EOF
 
 :error