First part is incorrect. Here is a little guessing game. Guess which one is McGehee's out of zone swing percentage. Is it A.) 29.2% B.) 40.6% C.) 34.7% D.) 31.6% He maybe out of balance and his bat speed may have slowed down which would explain for the poor hitting by McGehee. It is correct, though. His O-swing% is 29.2%, but his Z-swing% is only 60.8% (career low). Only 46% of his pitches seen are in the zone (also a career low), so he is seeing more non-strikes and swinging at them at the same % as he has in his career -- hence, he's swung at way more balls this year than in previous seasons. Casey has completely lost the ability to hit for power, his ISO is lower than every player with 200 PA's on the team, except for Kotsay. But Casey's O-swing% and Z-swing% are within his career norms. His Zone% is only 1.1% less than last year so that doesn't really explain anything at all. It probably has more to do with McGehee not generating any power on the pitches that he has been swinging at in the zone than anything else. His zone contact percentage is the same as previous years so it is not like he is swinging at bad pitches all the time and that is the reason why he is struggling this year. I believe the problem with Casey is that he is not generating any power at all in his swings when he is making contact in the zone.