The evidence is assuredly mixed when evaluating players who have participated in the Home Run Derby. This article, posted on the Baseball Digest web site, takes the numbers from the first and second half of the season to come to a conclusion. Is it because players with outsized home run totals get invited, and then regress to the mean in the second half? Is it the strain of swinging for the fences? Is it time in the post-steroid age to do away with this display of brute power -- the article doesn't address that, though.