How defense affects pitching
Every year, David Pinto at Baseball Musings releases the Probabilistic Model of Range , his very good defensive metric which measures batted ball characteristics like velocity and location in order to determine how many outs teams should have made on those batted balls relative to how many outs were actually made. This year, he also gave the PMR for defense behind pitchers , which Beyond the Boxscore translated into runs and ERA . If you doubt that defense can make much of a difference behind the pitchers, look at how the numbers ran for the Pirates. Ian Snell lost 0.63 of a run on his ERA, which would've brought his ugly 5.42 down to 4.79. Tom Gorzelanny adjustment is almost as big, while Zach Duke only lost about a tenth of a run to defense, according to this metric. Of course, looking at our pitchers' adjusted ERAs is still depressing because it really drives home just how poor our pitching staff was this year. The other interesting thing that leaps off the page at me is tha...