Schwellenbach won't start as scheduled Friday against the Cardinals, as the game was postponed due to rain.
Atlanta and St. Louis will play a doubleheader Saturday. Charlie Morton and Bryce Elder will start during the twin bill, while Schwellenbach will get bumped to Sunday's contest, per Justin Toscano of The Atlanta Journal-Constitution. The 24-year-old allowed four earned runs in five innings while striking out six batters and walking none in a loss the first time he faced the Cards on June 24.