Mason Tobin, rhp, Angels: The Angels placed Tobin, their No. 10 prospect, on the seven-day disabled list after Tobin left Wednesday’s game against Visalia with shoulder soreness, according to the Inland Valley Daily Bulletin:

"We’ll have to wait and see," Quakes manager Keith Johnson said. "We’ll see how he is in a few days, and if he feels OK, he’ll start throwing on the side. There is no timetable."

In his third appearance of the season, Tobin entered the game in the eighth inning and recorded two outs, but left after allowing four runs (none earned), two walks and one hit. Tobin was limited to 37 1/3 innings last year, when he strained his shoulder and didn’t pitch after June 6.

Casper Wells, cf, Tigers: Wells will have to put his plans to build upon an outstanding 2008 season on hold, as he’ll miss approximately two months with a fractured hamate bone in his left hand, according to Ron Leonardi of the Erie Times-News. Wells told the paper that he will have surgery on his hand, followed by a rehab period of six to eight weeks. Wells said he felt the injury while taking a swing on April 13, causing him to leave the game. Wells, who hit .289/.376/.589 in 75 games for Double-A Erie last year after starting the year in low Class A West Michigan, was off to an unusual start for Erie: he had more walks (seven) than at-bats, as he was 1-for-6 in four games.

Austin Jackson, cf, Yankees: Jackson was off to a fine start with Triple-A Scranton/Wilkes-Barre, going 12-for-25 with a triple, five walks and three steals in the team’s first seven games. Jackson had to leave the game on April 15, however, when he was hit by a pitch in his elbow in his first plate appearance. An X-ray revealed no structural damage, according to the Scranton Times Tribune, and Jackson returned to action last night, going 1-for-4 against Buffalo.

Will Smith, lhp, Angels: Smith made one start for low Class A Cedar Rapids, then retired the first two batters he faced in his next start on Saturday before being removed from the game. The Angels placed Smith on the seven-day disabled list retroactive to Monday with a left hamstring strain. Smith, 19, was the top pitching prospect in the Rookie-level Pioneer League last year and is one of the Angels’ top pitching prospects. He had a 3.08 ERA, 76 strikeouts and six walks in 73 innings last year for Orem.

Matt Wieters, c, Orioles: Baseball’s best prospect strained his right hamstring on Friday, leaving the game after one plate appearance in the first inning. Wieters had to cut his batting practice session short the next day, according to BA correpondent Roch Kubatko, and Wieters has yet to play since Friday. He should be back in the lineup soon, Orioles farm director David Stockstill told Kubatko yesterday.

"We’re still looking at another day or two," Stockstill said. "It could possibly be tomorrow. I don’t believe it’ll be today. But he feels good and is moving forward."

Yamaico Navarro, ss, Red Sox: Boston’s 21-year-old shortstop played for high Class A Salem on Opening Day, but he’s been out since then with a left wrist injury, according to the Roanoke Times. Navarro, Boston’s No. 10 prospect, hit .280/.341/.412 in 361 plate appearances last year for low Class A Greenville, then batted .348/.393/.508 in 196 plate appearances upon his promotion to high Class A Lancaster.

Michael Hollimon, 3b, Tigers: Erie took another hit when Hollimon came down with a bruised left knee, according to the Erie Times-News, which has kept him out of the lineup since April 14, though X-rays were negative:

"The bursa sacs exploded in my knee,” Hollimon said. "It looks like a grapefruit. You can chalk it up to a bad bruise, a bad contusion. I don’t know if there’s any timeframe when I’m back. They say bad luck comes in threes, so I’ve had my shoulder problem, my finger injury and now this with my leg. I’m hoping the injuries are all done.”

Quick Hits: Marlins righthander Ryan Tucker has spent the last week on the seven-day disabled list with a knee injury, according to the Palm Beach Post . . . Brewers center fielder Lorenzo Cain returned to Double-A Huntsville from the disabled list (hamstring). His legs seemed fine in his first game back at Carolina, where he showed plus-plus speed down the line on a pair of ground balls . . . The Braves placed lefthander Cole Rohrbough on the seven-day disabled list. Rohrbough, 21, made one start for high Class A Myrtle Beach: five innings, one run, one walk, six strikeouts.