See the surronding example.
Maroth is having a bad month, or in his case in 2003, a bad year. The Red Sox slap him around, and those three starts are weighed in on his ERA. Looking at Maroth:
2003:
Faces Red Sox on June 25th. Goes 7 IP 2 ER.
Month of June stats: 3.19 ERA
Faces Red Sox on July 11th and 25th. Goes 14.1 IP and allows 12 ER. The start on the 25th, he is left in during the 6th inning with 100 pitches, and the Red Sox tack on two more runs. Mismanagment of the Tigers pitching staff, may have elevated this number a bit.
Month of July stats: 7.20 ERA.
2004:
Faces the Red Sox on August 6th and August 27th. Goes 5.2 IP the first start and allows three runs. Throws 113 pitches, Red Sox score all their runs in the 6th inning. Mismanagment.
This goes on. Looking deeper, the Red Sox seemed to get Maroth when he was in a pitching slump, or got lucky because Alan Trammell did not know when to pull his starter.
Seriously, there are way too many explanations to just say that the Red Sox own Mike Maroth.