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07/06/12 2:09 AM ET

Kemp gets in seven innings in third rehab game

PHOENIX -- Matt Kemp continues to make progress and remains on track to join the Dodgers after the All-Star break.

On Thursday, Kemp went 1-for-4 with an RBI and played seven innings in center field in his third rehab appearance for Class A Rancho Cucamonga in a 5-2 loss to Inland Empire. He has five hits in 11 at-bats for the Quakes.

The plan for Kemp is to play one more seven-inning game, a nine-inning game and then one more at DH. He is scheduled to participate in the State Farm Home Run Derby, on Monday at 5 p.m. PT on ESPN.

Before the rehab assignment, Kemp had not played since he aggravated his left hamstring strain on May 30.

Dodgers lose Gordon for six weeks to thumb surgery

PHOENIX -- Dodgers shortstop Dee Gordon will have surgery on a torn ulnar collateral ligament in his right thumb on Friday and will miss at least six weeks.

Gordon injured the thumb on a headfirst slide while stealing third base, his Major League-leading 30th steal of the year, in the eighth inning against the Reds on Wednesday night in Los Angeles. The Dodgers activated reliever Javy Guerra from the disabled list to take Gordon's spot on the roster.

"It is what it is, man. There is nothing I can do about it," Gordon said. "I was starting to produce a little bit and help the team. For this to happen was definitely disappointing."

Gordon was hitting .229 in 301 at-bats in 78 games. In his absence, Dodgers manager Don Mattingly said he will use a combination of Elian Herrera, Jerry Hairston and Mark Ellis in the leadoff spot.

Hairston, Herrera, Luis Cruz and Juan Uribe will all see action at shortstop, the manager said.

"I feel bad for him. It's tough," Mattingly said. "But he's going to be fine. It's going to be a temporary thing and that's why I told him, 'It's not like Tommy John where we are not even thinking about you until the end of next year. This is six weeks. You'll be right here playing. Before you know it, you'll be back out there.'"

Gordon, who apologized to Mattingly for getting hurt after Wednesday's game, said his thumb feels strong and expects to participate in most baseball activities outside of throwing. He was expecting to hear that he had a partial tear and was surprised by the news that he needed surgery.

"Everybody is hurt," Gordon said. "The first thing I said when I got it was, 'Dude, I can't be hurt. Mark Ellis just came back. Matt [Kemp] is not back yet. Dre's [Andre Ethier] down. I can't be hurt right now.' That's the thing that ticked me off the most."

Earlier on Wednesday, the club placed Ethier on the DL with a strained oblique muscle and activated Ellis. Center fielder Kemp has been on the DL since May 31 with a left hamstring injury. Kemp is on rehab with Class A Rancho Cucamonga and is expected back in the lineup after the All-Star break.

"It's how the year's been," Gordon said. "As soon as things start going good, something else comes up."

Guerra activated, returns to Dodgers' bullpen

PHOENIX -- Dodgers reliever Javy Guerra was activated from the disabled list Thursday, but his role in the bullpen is still to be determined.

"We'll probably just try to get him out on the field one time and get him comfortable first," Dodgers manager Don Mattingly said. "We'll just use him accordingly and try not to overtax him at the start of this."

Guerra, who is 2-3 with a 3.38 ERA, had been out since June 3 with right knee inflammation and had arthroscopic surgery on June 5. He started the season as the team's closer but was eventually replaced by Kenley Jansen after early-season struggles.

Jesse Sanchez is a national reporter for MLB.com. Follow him on Twitter @JesseSanchezMLB. This story was not subject to the approval of Major League Baseball or its clubs.