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."