Justin Masterson struck out a season-high 11 batters while tossing seven scoreless frames in Sunday's 6-0 win over the Mariners.

Masterson permitted just three singles, walked a pair and hit a batter. The brilliant outing comes on the heels of a shutout of the Yankees, and he has now won seven games on the year. The big right-hander is looking much more like the 2011 version and in fact has been even better to this point. He'll bring a 2.83 ERA and 1.13 WHIP into Boston next weekend.

Justin Masterson picked up win No. 5 Wednesday, limiting the Athletics to three runs on just four hits and two walks over seven frames in the 4-3 victory.

He recorded seven punchouts. All four of the hits Masterson gave up came in Oakland's three-run fourth inning, and he also hit a batter that frame. He was (cough, cough) masterful otherwise, though. The big righty had struggled the last few times out, so this was a nice step in the right direction. He'll bring a 3.67 ERA and 1.24 WHIP into next week start against the Yankees.

Justin Masterson was clobbered for seven earned runs over 6 1/3 innings Sunday afternoon in the first half of a doubleheader with the Royals.

Masterson racked up a season-high nine strikeouts but nothing else about the start was positive. He yielded nine hits and four walks, falling to 4-2 and watching his ERA balloon from 1.85 to 3.12. The righty will try to get back on track next week against the Twins.