Harrison was 14–9, with a 3.39 ERA in 2011. He started the game the Rangers won to clinch the AL West (Pitched 6 innings, gave up 1 run). Harrison won Game 4 Of the ALDS versus the Tampa Bay Rays. With that win Texas won the series and advanced to the ALCS. The Rangers lost to the St. Louis Cardinals in the 2011 World Series.