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06/12/11 8:25 PM ET

Rubby exits Dodgers start with forearm cramp

Rookie should be ready for next outing on Saturday

DENVER -- Dodgers rookie starting pitcher Rubby De La Rosa, clocked earlier at 100 mph, left Sunday's game after the first pitch of the bottom of the sixth inning with a forearm cramp believed to have been caused by dehydration.

De La Rosa, who had made 83 pitches, threw a strike to Troy Tulowitzki and felt a cramp under the forearm above the wrist that locked his index finger in a curled position.

The Dodgers believe De La Rosa didn't drink enough liquids playing in the Mile High City, and he should be ready to make his next scheduled start Saturday.

Catcher Rod Barajas motioned to the dugout that the pitcher was in trouble, and pitching coach Rick Honeycutt and assistant trainer Todd Tomczyk went to the mound.

After a brief conversation, Honeycutt motioned to the dugout that De La Rosa couldn't continue. Ramon Troncoso, the closest thing to a long reliever in the Dodgers' bullpen, was brought in to relieve in a double-switch, with manager Don Mattingly taking out Andre Ethier and putting Tony Gwynn in left field. Trent Oeltjen moved from left to right.

De La Rosa (3-0) allowed a three-run homer to Seth Smith in the first inning and only one hit after that, walking three with six strikeouts in the Dodgers' 10-8 win. On the third strike to Tulowitzki to end the third inning, De La Rosa was clocked at 100 mph.

LA wants one more rehab outing for Jansen

DENVER -- Dodgers reliever Kenley Jansen, on the 15-day disabled list, has been perfect in three rehab innings and is eligible to be activated Monday, but manager Don Mattingly said the club would like him to make one more extended Minor League appearance and rejoin the Major League team later next week.

"We'd like to stretch him out a little more," Mattingly said of Jansen, who pitched two perfect innings Saturday night.

Mattingly said before Sunday's 10-8 win that the decision might depend on how many relief innings were required from the bullpen in the finale at Coors Field. After using four relievers following Rubby De La Rosa's exit with a forearm cramp, Mattingly said Jansen's activation would be discussed.

The bullpen pitched 13 1/3 of the 34 innings in the series in Colorado.

"It would be nice if it works out the way we plan it," Mattingly said. "Sometimes you do what's necessary."

The club wants to have a pitcher who can go multiple innings of relief, even though Jansen has the stuff to close. Currently, Ramon Troncoso is the only reliever who seems to have the durability to pitch more than two innings a game.

Mattingly said Hong-Chih Kuo, who struck out the side in his Saturday night rehab appearance, showed improved velocity.

"He touched 96 and that's a good sign," Mattingly said. "It tells me in his mind he's letting it go and he's feeling fine. Stan [Conte, trainer] said he'll talk to him today and see where we go next."

Kuo is coming back from anxiety disorder, and he will dictate his return when he feel he's emotionally ready.

Jonathan Broxton said he was able to throw breaking balls in his Saturday bullpen. Mattingly said Broxton will likely have another bullpen session Tuesday, then face hitters later next week before going on a rehab assignment. Without a setback in his bruised elbow, he could rejoin the club by the end of the month.

Blake misses second start with stiff neck

DENVER -- Matt Kemp started for the Dodgers again Sunday, slumping Juan Uribe was back in there and so were mini middle infielders Jamey Carroll and Aaron Miles after combining for eight hits on Saturday, but Casey Blake missed his second start with a stiff neck.

Kemp reported his left hamstring, which kept him out of Friday night's starting lineup, felt better Sunday morning than it did Saturday, when he played all nine innings and had an RBI double.

Blake also reported improved range of motion in his neck, which came up sore during Friday night's game. He was able to deliver a three-run pinch double Saturday night and grounded out as a pinch-hitter in the ninth inning Sunday in the Dodgers' 10-8 win.

"Casey's getting better," Mattingly said. "He can play in an emergency, but it's something we'd like to try to get rid of."

Uribe has been studying film with coach Manny Mota to eliminate his flailing at outside breaking balls.

Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.