Aaron Hill hit only .205 for the Toronto Blue Jays last season, .081 points below his career average going into the season. His line went from .286/.330/.499 in 2009 to .205/.271/.394 in 2010. While the 100 point drop in slugging percentage was certainly a problem, the drop in OBP was almost entirely due to a lack of hitting - his walk rate actually increased 1.4% in 2010.
Going into the season Hill had a career BABIP of .307; in 2010 it hit a career low .196. When we look at his splits we see that Hill had a ton of trouble against left-handed pitching. His BABIP was a ridiculously low .124, indicating he may have been a bit unlucky. However, his overall line drive percentage was 8 percentage points below his previous league average last season. Against lefties, his line drive percentage was only 2.3%, and he had a .118 batting average on ground balls against southpaws. So while bad luck may have contributed, Hill wasn't getting many solid hits either.