Roy Halladay (PHI) allowed his second home run of the season on Sunday, a shot by Dan Uggla (ATL) that cost him the game. Halladay is a great pitcher, but he does allow a decent number of home runs. Having given up just two one quarter of the way through the season is unusual for him. The other unusual aspect of this season is that both home runs came off the bats of right-handed batters.
During the three previous seasons, Halladay saw a left-handed batter about 55% of the time, and they hit 38 of the 64 home runs against him, or 59%. Roy worked lefties in and out, avoiding the middle of the plate as much as possible:
These batters were able to take the high and low inside pitches deep:
So far in 2011, Roy reduced his use of the inside part of the plate against left-handers:
Roy throws mostly on the outer half of the plate against left-handed batters now, and he's been rewarded with no home runs allowed from that side of the plate. Lefties slugged .372 against him from 2008-2010, but that's down to .277 this season.