Let's take a look at how each side of the plate fared against these pitchers:
OPS against by Right-handed Batters in 2010
OPS against by Left-handed Batters in 2010
If Dotel were to only face righties and Fuentes lefties last year and you combined these totals, this would have resulted in a hitters OPS against of .526. As a comparison hitters have a career .552 OPS against Mariano Rivera. Unfortunately the last time I checked teams were allowed to pinch hit and each team requires three outs to complete an inning.