MINNEAPOLIS — Extra time with his hitting coach has paid off for Trevor Plouffe.

Plouffe hit his first grand slam in the majors and drove in a career-high five runs, powering the Minnesota Twins past the Chicago White Sox 13-3 Sunday for a four-game sweep.

Brian Dozier added a career-high four hits as the Twins won for the seventh time in nine games.

Plouffe was batting .143 on April 17 but has hit .364 since. He credits much of that to working with hitting coach Tom Brunansky to find a rhythm.

“We were doing a lot of stuff with a fungo, things we hadn’t been doing previously. We did that a lot and fixed what we needed to fix,” Plouffe said. “So we said let’s back off now and just go up there and hit, That’s what we’ve been doing the last couple of days.”

Avisail Garcia had three hits for Chicago, which has lost five straight and been outscored 39-10 in those games.

“I don’t think there was anything we were good at today. We have to check ourselves and get back after it,” manager Robin Ventura said. “You can’t go out there and lay an egg like that.”

Minnesota is above .500 for the first time since the Twins were 23-22 before play last May 24.

Ryan Pressly (1-0) pitched 2 2-3 innings of hitless relief. Starter Mike Pelfrey allowed five hits and two earned runs in 3 1-3 innings, hitting three batters and walking two.

John Danks (1-3) lasted just 2 1-3 innings and gave up seven runs — three earned — and eight hits. He also made two errors.

“It’s pretty awful,” he said. “I set the tone. I didn’t give us a chance to win from the start. Falls all on me. Yeah, bad game. Wasn’t fun.”

It was scoreless until Minnesota broke away by scoring seven runs in the third.

With runners on first and second, Danks couldn’t handle a throw from Adam LaRoche while covering first base for an error. Plouffe then cleared the bases with his slam, a drive into the seats in left-center field for his second home run in as many days.

“I know he’s not trying to hit home runs,” Minnesota manager Paul Molitor said. “He’s kind of one of those guys who tries to drive the ball gap to gap and when he’s getting mistakes he’s taking advantage.

Danny Santana added a two-run single past LaRoche, and Dozier had an RBI single to make it 7-0.

Struggling with his control in the fourth, Pelfrey loaded the bases with no outs on a walk, a hit and a hit batter. With one out, Geovany Soto and Micah Johnson were each hit by pitches, finishing Pelfrey.

“I didn’t leave them much choice,” Pelfrey said.

Plouffe, Oswaldo Arcia and Chris Herrmann had RBI singles in the fourth to make it 10-2.

Kennys Vargas homered in the Twins sixth.