Sometimes pitchers talk about their job and it's unclear what they're saying. They're on a different plane and their thoughts float over your head like a balloon caught in the breeze.

Justin Masterson isn't like that.

In explaining the Indians' 4-0 victory over Chicago on Sunday afternoon, in which he threw his third shutout of the season, Masterson said: "They hit the ball on the ground and with me that means they either hit it at someone or not at someone. Today they hit it at someone."

Masterson's six-hitter completed the Indians' first four-game sweep of the White Sox in Chicago since 1948. They have won 14 of 19 games and moved into a first-place tie with Detroit in the AL Central as the Tigers lost for the second straight day to Tampa Bay.

In winning his 10th game, Masterson struck out eight and recorded 14 ground-ball outs. It was the second time this season that he's shut out the White Sox. Masterson's infield defense was in top form, turning four double plays. Catcher Yan Gomes contributed by picking off fleet Alejandro De Aza at first after his leadoff single in the fourth.

When asked what was working particularly well for him, Masterson said: "The defense was working great for me. Those guys were working hard. This whole weekend has been about the position players.

"We've tried to go out and pitch when we've had to, but we got here at 4 a.m. Friday morning and played a doubleheader. We came out the next day still scoring runs. Today we came out and played solid offense and good defense. That's a testament to what this team all about."

Masterson (10-6, 3.48 ERA) threw 112 pitches, including 73 strikes. He leads the AL in complete games and shutouts with three each.