Assigning gains or losses after a player move is a bit of a mug’s game. The change in home ballpark affects only half the games, after all, and we have to consider such other factors as lineup differences, new managers and teammates, even weather.

Last month, the Batting Buyers Guide examined hitters who had very poor seasons in 2011, looking at which of them might be most likely to “regress to the mean” of their weighted average performance from 2008-10. As with last time, we started by finding the batters whose 2011 seasons varied sharply from their norms, this time by doing far better than their norms suggested.

In this edition of the Batting Buyers Guide, we’ll look at players who had unusually poor seasons, and assess their capacity to “bounce back” to useful productivity levels; the next edition, in early January, will identify and assess some of 2011’s overperformers.

With about 10 games left in the regular season, it's time for us to declare our 2011 Fantasy Baseball All-Star batters.