David Wells Last 3: 13.50 ERA, 2.37 WHIP
Braden Looper Last 3: 9.88 ERA, 1.98 WHIP
The natural knee-jerk reaction would be to look to the Over here, but 9.5 is rather high for a San Diego game. Remember that the Padres are only hitting .239 as a team vs. right-handers, and once Wells is out of the game, they have the lowest bullpen ERA in the National League. Also, the Cards are hitting a modest .257 vs. lefties, and their pen is not atrocious.
The other alternative is to look to the dog, and that is what I did here with the Pads. I think Wells is more likely to turn back the clock and throw a decent game than Looper is, as he is a converted reliever that looks to be wilting under this new workload. Also San Diego will have the edge in the late innings.