Justin Masterson is a reliever.

Justin Masterson is dominant against right-handed hitters. But lefties reach base well over the league-average. Meaning that Masterson will have trouble until he can establish an "out-pitch" to retire them. Or develop his command more so, which is a possibility. Because currently, Masterson still catches too much of the inner half of the plate, at least against left-handers. And 2009 hasn't been any different either. A relatively small sample, but Masterson's .794 OPS against lefties just isn't going to cut it.