1. Adam Dunn (CIN)
Aug. 1, 2006 vs. Los Angeles Dodgers
-2.947 Moneyball Runs
With two outs in the top of the seventh, Dunn not only failed to field a ball that most left fielders would have caught (maybe 15 or 20 feet to his left), but he couldn't even stop it from getting to the fence, allowing three runs to score and handing LA's Rafael Furcal a double.
Link to article: http://mlb.mlb.com/NASApp/mlb/news/a...=.jsp&c_id=mlb