Joe Ortiz. Sure, he's the youngest arm in the bullpen, but lefties are 4-31 (.129) against him so far this year.
A W's a W, though, and damn that had to have been the most exciting game I've attended in a long time. Cabrera at his best is a sight to behold.
Gotta say I'd sure like to see Pujols have a 3-homer game or two against the A's in the near future...