Oswalt had a neck bruise. The Phillies said he did not lose consciousness and was not dizzy before leaving in the fourth inning.
Oswalt fell to the ground and remained there until a trainer and manager Charlie Manuel reached the mound to check on him. The right-hander was down less than a minute before standing up and walking to the visiting clubhouse on his own.
Evan Longoria homered leading off the fourth against Oswalt. Ramirez, who had a RBI double in the first, was the next batter.