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7/20/2014 7:55 P.M. ET

Dominguez caps big day with go-ahead double

Praised by Porter, third baseman finishes triple shy of cycle, drives in four

CHICAGO -- Matt Dominguez said he knew he wasn't going to hit a triple to fulfill the cycle as he stepped to the plate for his fifth and final at-bat in the Astros' 11-7 win over the White Sox on Sunday.

He wasn't even sure if he had a three-base hit before in his four-year career.

"Guy probably broke his leg on the ball," Dominguez said when told he hit two during his first season in Houston two years ago.

The third baseman hit cleanup on Sunday, bringing with him a .218 (12-for-55) average in July and 1-for-8 outing in the first two games of the series. He heads into the Oakland series coming off a 3-for-5 game where he belted his 12th homer and knocked in four runs. In a four-run seventh, Dominguez's RBI double broke a tie and put Houston ahead to stay.

Yet Dominguez insists he didn't change his plate approach against the three Chicago pitchers he faced, including Sunday's left-handed starter, John Danks.

"Just doing the same thing -- get a good pitch to hit," Dominguez said. "I was able to do that, get a pitch up in the zone and get the barrel on it. That's how it goes."

Manager Bo Porter praised Dominguez's demeanor and credited the veteran as one of the clubhouse leaders.

"Matty's been working hard," Porter said. "He's one of the guys that we look to to drive in runs and today was a prime example of his hard work paying off and getting some big RBIs."

Dominguez heads into the Oakland series having played in all 98 games, of which he's manned third base for 94. When asked how he feels about being the team's Iron Man, Dominguez said: "I'm just happy to be in the lineup. If they keep running me out there, I'm going to keep playing. I've been fortunate to stay healthy."

Daniel Kramer is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.