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7/9/2013 12:30 A.M. ET

Padres announce players of month for June

SAN DIEGO -- The Padres Player Development Staff selected their Minor League Player of the Month for June on Monday.

Class A Lake Elsinore shortstop Jace Peterson was named hitter and baserunner of the month, Double-A San Antonio starter Keyvius Sampson was named pitcher of the month and Triple-A Tucson infielder Dean Anna was named the defensive player of the month.

Peterson hit .389 in June and hit safely in 24 of 27 games, including an eight-game hitting streak to begin the month and a 14-game streak from June 10-27. He scored 25 runs, hit four doubles, four triples and four home runs with 19 RBIs. He was also named the baserunner of the month after successfully stealing all 12 bases he attempted.

Peterson was taken in the first round (58th overall) by the Padres in the 2011 MLB First-Year Player Draft.

Sampson was 3-1 with a 2.20 ERA in six games and five starts for Double-A San Antonio in June. He struck out 32 in his 28 2/3 innings pitched, holding opposing batters to a .200 batting average. He was drafted in the fourth round in 2009 by the Padres.

Anna did not make an error in 29 games for Tucson in June, despite splitting time between three different positions -- 11 games at second, four at third and 18 at shortstop. He even played a game in the outfield when the team needed him. Anna -- a former 26th-round Draft pick in 2008 -- has a .987 fielding percentage this season.

Grandal set for ACL surgery, likely out 9-12 months

SAN DIEGO -- Padres catcher Yasmani Grandal will need reconstructive surgery to his anterior cruciate ligament that will end his season, an MRI revealed on Monday.

It's unclear whether Grandal will be ready for the start of Spring Training, as the normal rehab for this injury usually takes about nine to 12 months.

"And everybody's different," said Padres manager Bud Black.

Grandal will have the surgery in about two weeks, after the swelling in his knee subsides. He also has damage in his posterior cruciate ligament, but that won't require surgery. The injury occurred on Saturday when the Nationals' Anthony Rendon slid into Grandal's knee on a force play at the plate. The Padres knew it was serious from the start, and the club placed him on the 60-day disabled list on Sunday.

Grandal's season ended before it really had a chance to get started. The 24-year old played in just 28 games after serving a 50-game suspension for performance-enhancing testosterone to start the season. He hit .216 with one home run and nine RBIs.

The Padres have been hampered by injuries all season long and are already without their starting first baseman (Yonder Alonso), second baseman (Jedd Gyorko) and center fielder Cameron Maybin.

Brach replaces Erlin for bullpen depth

SAN DIEGO -- The Padres optioned left-hander Robbie Erlin to Triple-A Tucson and recalled righty Brad Brach on Monday.

The move comes in part due to Erlin's struggles in his past two starts against the Nationals and Red Sox and because the Padres needed some help in the bullpen. This will be Brach's third stint with the Padres this season.

"Our bullpen has been taxed over the past 10 days and I felt as though we needed a fresh arm," said Padres manager Bud Black. "Robbie's last couple performances have been such where I think there was a couple things that required immediate attention, and he'll get that in the Minor Leagues."

Erlin allowed 12 runs on 11 hits and walked seven in his first two career starts on the road (at Boston and Washington). That's a 14.08 ERA over 7 2/3 innings.

"Trying to be too fine and felt like I tried to do a little bit too much," Erlin said. "That comes from a lack of execution."

In his first two starts, both at Petco Park, Erlin produced solid outings. On June 1 against the Blue Jays he allowed eight hits and gave up two runs in 6 2/3 innings. His next start came on June 26 against the Phillies, where he scattered four hits and two runs in 6 1/3 innings.

"I think the biggest difference is the fastball command," Erlin said about his first two starts and last two. "The offspeeds were a little bit inconsistent at times in all four of them. I was able to get that feel back in the first two, and finish the game strong. Fastball command is what I relied on in the first two and I didn't have it in the second two. It's tough to get by."

The Padres have not announced who will start Friday against the Giants in Erlin's spot.

Alonso goes hitless in first rehab game

SAN DIEGO -- Padres first baseman Yonder Alonso went 0-for-3, grounding out twice and lining into a double play, in his first rehab game for Triple-A Tucson on Monday.

Alonso, who played six innings on Monday, been on the disabled list since June 6 (retroactive to May 31) with a broken bone in his right hand.

Alonso will play again on Tuesday before the Padres reevaluate him, but manager Bud Black said it is possible that Alonso could return before the All-Star break.

"If we feel that he's over that hump and he's painless and taking good swings, there's a chance by the weekend," said Black.

Short hops

• Matt Wisler has been named the Texas League Pitcher of the Week for July 1-7. He won his only start for Double-A San Antonio by striking out six in six innings and allowing just two hits and one walk. Wisler was selected in the seventh round of the 2011 First-Year Players Draft.


Jamal Collier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.