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06/15/12 8:10 PM ET

Improved Hendriks back with Twins

MINNEAPOLIS -- Right-hander Liam Hendriks was recalled from Triple-A Rochester on Friday and will start against the Brewers on Saturday.

The move was made official after the Twins' 5-3 loss to the Brewers, as reliever Lester Oliveros was optioned to Triple-A Rochester to make room for Hendriks. Oliveros, who was recalled on Thursday and allowed a run on one hit over 1 2/3 innings against the Phillies.

Hendriks bounced back from a slow start with the Twins, as he impressed at Rochester after posting a 9.00 ERA in four starts with Minnesota. Hendriks went 5-0 with a 1.94 ERA in seven starts with the Red Wings. He struck out 42 and walked 13 in 46 1/3 innings.

"I've been messing around with mechanics a little bit, just trying to get a little bit more comfortable and I finally hit a little groove," Hendriks said. "I had life to my fastball, which is always good to have. I was keeping the ball down and had life on my fastball and changed up my curveball a little bit, so that it bites instead of just dropping."

Hendriks said the key to the turnaround was establishing his fastball early in counts and improving his command.

"Up here, I was flipping up too much off-speed and not doing what got me here," Hendriks said. "And that's establishing my fastball and let the off-speed work off that. I was doing it the other way around, and it just wasn't working for me."

Twins manager Ron Gardenhire said he got good reports on Hendriks, who is ranked as Minnesota's No. 7 prospect, according to MLB.com.

"He just got of whack here earlier because he couldn't get his fastball where he wanted it to," Gardenhire said. "He ended up misfiring and getting behind in the plate. So I think the one thing everybody has impressed on him is that he has to locate his fastball, more than anything else."

Morneau sits with sore forearm

MINNEAPOLIS -- Twins first baseman Justin Morneau was held out of the lineup on Friday against the Brewers with a sore left forearm. He is listed as day to day.

Morneau hurt his forearm while swinging the bat, but it's not considred a serious injury, according to Twins manager Ron Gardenhire.

"He's got a little soreness in his left forearm, so rather than him come out and take some swings and see how it was, I said, 'Let's back off and let's let it get well,'" Gardenhire said. "He was sore after the game [on Thursday]. He came in [Friday] and said he felt better, but he wanted to go test it and I said, let's take a day.

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"We'll see if we can get him back out there [on Saturday]. It's not a big deal. It doesn't sound like it. But definitely something that was bothering him during the game swinging."

Morneau, who missed 15 games in early May with a sore left wrist, is batting .241 with 10 homers and 33 RBIs in 41 games.

Twins sign Draft pick Berrios

MINNEAPOLIS -- Right-hander J.O. Berrios, the No. 32 overall pick in this year's First-Year Player Draft, was at Target Field on Friday to officially sign his contract.

Berrios, who went to Papa Juan XXIII High School in Puerto Rico, said he was excited to get his professional career started, according to translator and Twins scout Hector Otero.

"It was his dream since childhood to be drafted by a Major League team, so when he heard his name it was something unbelievable," Otero said. "He couldn't wait to come to Minnesota and start his career."

Berrios, 18, will report to the Gulf Coast League Twins to begin his career. Otero said that Berrios has made big strides on the mound over the last year, including a no-hitter in a showcase game that included Carlos Correa, who was the No. 1 overall pick in the Draft.

"His velocity has been improving for the last year," Otero said. "He was from 90-92 early in the spring to consistently 94-96. It's been impressive. So he's been consistent. He's been dominant with lots of strikeouts in every game."

Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.