Masterson has been plagued by umpire problems his last two starts. In his last start, he had 14 pitches in the strike zone called balls by Sam Holbrook. (Sam Holbrook also called Ellsbury out at second base two games later based upon Lugo's slide into second.) With Mike Everitt he lost only two calls based upon the regulation strike zone, but he didn't get strike calls on six other pitches right off the edge of the black at locations where Everitt called strikes for other pitchers of both teams. When a pitcher takes a net loss of twenty-odd ball-strike calls, it costs him and his team about 2-4 runs. Give Masterson back three runs and his ERA for those two games goes from 6.00 to 3.75, and 3.75 is right where we'd expect Masterson's ERA to be.
So let's look at the umpire for today's game. Kerwin Danley is scheduled. Some factoids:
1) The Yankees have won four in a row with Danley calling balls and strikes.
2) The Red Sox have lost three in a row with Danley calling balls and strikes.
3) Going back to 2001, here are Mike Mussina's games started with Danley behind the plate:
4/4/06 7 IP, 3 ER, ND (2 HR allowed)
6/26/03 7.1 IP, 2 ER, W
7/19/02 8 IP, 2 ER, L
6/18/02 6 IP, 5 ER, W (2 HR allowed; Coors Field, light wind blowing out)
10/13/01 7 IP, 0 ER, W (ALDS)
Mussina's ERA in those five games is 3.06. A third of the runs allowed were home runs. Discounting the win at Coors with the wind blowing out, Mussina has a 2.15 ERA with Danley calling balls and strikes.
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Here's my take: the first thing to check is whether Danley is calling the same strike zone for Masterson and Mussina, especially regarding Masterson's inside pitches to LHH (that's where Holbrook screwed Masterson). If they're getting the same strike zone, more or less, the issue then becomes whether or not the Red Sox can get a couple of home runs--that seems to be the ticket for scoring enough runs to have a chance against Mussina with Kerwin Danley calling behind the plate.