Rick Porcello kept everything down. A ground ball here, a ground ball there. Ground balls everywhere. But with the Tigers leading the Chicago White Sox by two runs in the fourth inning Wednesday night at Comerica Park, he left a slider up. And catcher Tyler Flowers didn’t miss. Representing the tying run, Flowers hit a towering fly ball to leftfield. It was high. It was deep. It landed in Andy Dirks’ glove on the warning track. The one time Porcello needed to keep the ball down, the strong left-to-right breeze at Comerica Park did. And two innings later, the meat of the Tigers’ order drove the White Sox into the ground. Powered by three-hit nights from Miguel Cabrera, Prince Fielder and Victor Martinez, the Tigers beat the White Sox, 8-5. “We had some really good at-bats,” manager Jim Leyland said. “Just a good win for us, because you can see we’re starting to play better.” Fielder keyed the 15-hit offensive explosion early with a two-run home run to right in the first inning, his 16th of the season. The teams traded runs in the second, and Alex Avila put some distance between the two with a two-out, two-RBI single to right. It was a familiar theme. The Tigers scored all of their runs with two outs. In the first, it was Fielder. The third, Avila. And in the sixth, the Cabrera-Fielder-Martinez trio gave the bullpen enough cushion with consecutive RBI singles. Fielder and Martinez, to the opposite field. “His approach right now is terrific,” Leyland said of Martinez, who extended his hitting streak to 12 games. “I’ll take that. I like that a lot.” Porcello moved to .500 on the season with a solid, six-inning performance. He allowed three runs on seven hits, didn’t issue a walk and struck out six — the eighth time this season he’s struck out six or more. “I thought he really battled hard and made some pitches when he needed to,” Leyland said.