Wainwright stopped warming up and returned to the clubhouse prior to his scheduled start Sunday, MLB.com's Jenifer Langosch reports. Wainwright was originally scheduled to take the hill for the Cardinals on Sunday, but following the Pirates' loss to the Reds, St. Louis has officially clinched the NL Central division. Nick Greenwood is now warming in up Wainwright's place, and appears to be the likely candidate to start over the Cardinal's ace in Sunday's regular season finale. This would leave Wainwright open to start Game 1 of the NLDS, where he'll likely square off against Clayton Kershaw of the Dodgers.