The Pittsburgh Pirates defeated the St. Louis Cardinals on Tuesday by the score of 5-2 . The win improved the Pirates to 68-64, third in the National League Central. Ike Davis broke a 2-2 tie in the eighth inning with a three-run home run. Tony Watson got the win in relief to improve to 9-1 on the season. On the injury front, pitcher Charlie Morton, who has been battling a hip injury and sports hernia, will start a rehab assignment on Thursday.