League Adjusted ERA

ERA+ can be a useful tool in comparing a pitcher's ERA versus the league average. Thanks to the league average information provided by the Red Sox Stats Blog, I was able to compute each player's league adjusted ERAs. An ERA+ over 100 indicates better performance than the league average and vice versa for under 100.

Using this statistic I compared several of the Sox top pitching prospects (stats are not park adjusted).

AAA- International League (lg ERA 3.85)

Michael Bowden-- 116

Clay Buchholz-- 182

AA- Eastern League (lg ERA 3.88)

Felix Doubront-- 109

Junichi Tazawa-- 124

Adv. A- Carolina League (lg ERA 4.07)

Casey Kelly-- 202

Kyle Weiland-- 99

A- South Atlantic League (lg ERA 3.63

Casey Kelly-- 324

Stolmy Pimentel-- 131

Brock Huntzinger-- 101

This really puts into perspective the dominating performance by Casey Kelly at both levels this year. Dominance may be an understatement in his case. Although we had no doubt his season was spectacular, ERA+ allows us to compare him to his peers and see that he is out-pitching his league by a wide margin.