Twins sent OF Darin Mastroianni outright to Triple-A Rochester.

The move clears a spot on the 40-man roster. Mastroianni showed some ability in 2012, but he was limited to just 30 games with the Twins this year due to ankle surgery.

Darin Mastroianni underwent left ankle surgery last week.

The surgery involved removing the fixation hardware in his ankle from his previous surgery in May. Mastroianni is expected to be ready for spring training.

Darin Mastroianni went 3-for-6 with three RBI against the Astros on Tuesday.

The 28-year-old enjoyed his best offensive night since coming off the disabled list -- and best of the season, as it were -- with his three hits and three RBI. The big hit came in the 12th inning, as Mastroianni doubled in two runs to give the Twins a three-run lead. All four of his runs batted in this season have come in his last two games.

Twins recalled OF Darin Mastroianni from Triple-A Rochester.

Mastroianni has been limited to just eight games in the majors this season due to ankle surgery. He should see some playing time in center field against lefties, and his speed makes him worth a roster spot in deep AL-only formats.

Twins activated OF Darin Mastroianni from the 60-day disabled list; optioned him to Triple-A Rochester.

Mastroianni suffered a hyperextended right knee Wednesday while trying to beat out a double play in a rehab game. He might not return to the Twins at all this year.

Darin Mastroianni (ankle) has been diagnosed with a hyperextended right knee.

He suffered the injury while trying to beat out a double play in a rehab game Wednesday. Mastroianni should be able to return to games in the next couple days.

Darin Mastroianni (ankle) was removed from his rehab game at Triple-A Rochester Wednesday.

Mastroianni's foot came off first base awkwardly after he beat out a double play. He was able to walk off on his own, which hopefully means the injury isn't a huge setback. Mastroianni initially hurt his ankle on March 25 and has been working back ever since.

Darin Mastroianni's (ankle) rehab assignment has moved to Triple-A Rochester.

He's batting second and playing center field for the Red Wings on Wednesday. Mastroianni could potentially return to the Twins this month. He'll function as a reserve outfielder in the Twin Cities whenever he's activated.

Darin Mastroianni (ankle) has been sent to the Twins' spring training complex in Fort Myers, Florida to begin a minor league rehab assignment.

Mastroianni initially hurt his ankle on March 25, and Minnesota's medical staff, in its infinite wisdom, prescribed a short amount of rest. The speedy outfielder will DH and play five innings on Saturday for the Gulf Coast League Twins. He'll then sit on Sunday and return to the lineup on Monday. Mastroianni could potentially return to the Twins this month, but all bets are off due to the nagging nature of his malady.

Darin Mastroianni (ankle) will begin a minor league rehab assignment on Saturday.

Mastroianni will report to the Gulf Coast League Twins, where he'll DH and play five innings on Saturday. He'll then sit on Sunday, and return to the lineup on Monday. He's likely facing a lengthy rehab assignment, since he's been sidelined since mid-April, but the speedy outfielder should return to the Twins at some point in August.

Darin Mastroianni (ankle) will report to the Twins' spring training complex in Fort Myers, Florida on Sunday.

"I'll be starting basically a mini-Spring Training," Mastroianni told Rhett Bollinger of MLB.com on Thursday afternoon. "I'm not ready to play in games. So it's going to take a little while to get my legs underneath me and get into playing shape." The 27-year-old outfielder has been sidelined since mid-April with left ankle issues.

Darin Mastroianni (ankle) ran at full speed and hit in the batting cage on Thursday.

Mastroianni's surgically-repaired left ankle was a little stiff after he ran, but it loosened up as he went through the workout. "I didn't feel any pain at all as I was swinging, and it loosened up as I worked," he said. "For it to actually feel better as I worked it, that was really great. It was a big step." Mastroianni will have an X-ray taken next Tuesday to see how his ankle has healed, but he says he's "way ahead of schedule." The Twins hadn't been expecting him back until August.

Darin Mastroianni has had the cast removed from his surgically-repaired left foot.

He'll now wear a walking boot for about two weeks. Mastroianni isn't expected back until after the All-Star break.

Darin Mastroianni underwent surgery Thursday to repair bone chips on his left ankle.

The best-case scenario is that Mastroianni will resume weight-bearing activities in three weeks. However, he's expected to be sidelined until the second half of the season.

Twins transferred OF Darin Mastroianni from the 15-day disabled list to the 60-day disabled list.

The move clears a spot for Chris Colabello on the 40-man roster. Mastroianni is scheduled to undergo surgery Wednesday to repair a bone chip on his left ankle and will be sidelined until the second half of the season.

Darin Mastroianni will undergo surgery on Wednesday to repair a bone chip on his left ankle, and will be sidelined for at least six weeks.

It was a very discouraging sign when Mastroianni, who was already progressing slowly in his recovery, was uncomfortable testing his ankle during light sprints on Wednesday. He shouldn't be expected to return to the Twins until after the All-Star break and can safely be dropped in deeper mixed formats.

Twins assistant general manager Rob Antony said Wednesday that Darin Mastroianni didn't feel comfortable while testing his left ankle with light sprints.

Mastroianni was diagnosed with a stress reaction in his ankle in mid-April and has struggled to make much in the way of progress. His return isn't considered imminent, so he could be a candidate for the 60-day disabled list at some point soon.

Darin Mastroianni will keep his left foot in a walking boot for another week.

Mastroianni was diagnosed with a stress reaction in his ankle in mid-April and needs more time to recuperate. He'll need to go out on a minor league rehab assignment once he's back to full health, so he's unlikely to rejoin the Twins until around the end of the month.

Darin Mastroianni (ankle) is still expected to be sidelined for "awhile" with a stress reaction in his left ankle.

Mastroianni will remain in a walking boot for at least another week, and will then have to go out on a minor league rehab assignment. He hasn't been doing any baseball activities while sidelined, so it's expected he'll need a fairly lengthy rehab assignment before he's ready to return. It's a tough break for the speedy outfielder, as he could've stolen the starting center fielder's job away from the struggling Aaron Hicks had he remained healthy.

Darin Mastroianni will be sidelined for three weeks with a stress reaction in his left ankle.

Mastroianni initially hurt the ankle on March 25 and was finally placed on the disabled list Tuesday. He'll wear a walking boot for the next 10-14 days. Oswaldo Arcia was recalled to replace him on the roster.