Roy Oswalt leaves with back tightness

ST. LOUIS -- Phillies right-hander Roy Oswalt left his start against the St. Louis Cardinals on Thursday night after two innings because of tightness in his lower back.

Oswalt gave up four runs on five hits and departed trailing 4-0. It was his shortest stint since a two-inning effort on September 10, 2009.

Oswalt gave up a home run in the first to Jon Jay. He then allowed three successive singles to begin the second inning.

The 33-year-old Oswalt was on the disabled list from April 27-May 16 with lower back inflammation. A three-time NL All-Star, Oswalt has won 10 or more games in nine of his 10 seasons. He threw 37 pitches on Thursday -- 26 for strikes.