LAKE ELSINORE, Calif. -- Dodgers starter Zack Greinke allowed eight runs (five earned) on six hits in 4 1/3 innings while making his first rehab start for Rancho Cucamonga after breaking his left collarbone a month ago.

Greinke, originally expected to be out for two months, made 80 pitches, fielded a comebacker and a bunt and didn't appear to be in any discomfort from the collarbone, although he did make several deep bends at the waist while on the mound. Lake Elsinore's (Padres) Robert Kral had three extra-base hits against Greike -- a homer and two doubles. The Quakes made three errors behind him. Greinke had four strikeouts without a walk.

Dodgers general manager Ned Colletti, Minor Leagues vice president DeJon Watson and medical director Stan Conte watched the outing to determine if Greinke is ready to rejoin the Dodgers and start on Wednesday or if he needs another rehab start.

"If the doctors say he can pitch, we're going to let him pitch," Dodgers manager Don Mattingly said at Dodger Stadium before Friday night's game.

"We feel like his arm is going to be ready to pitch. He's going to throw 75 pitches or around there if he's not having any problems. As long as the doctors relatively say this is safe for him to pitch with, then he wants to pitch and he probably thought he could have pitched tonight [for the Dodgers], knowing Zack. He would have pitched tonight if the doctors said he didn't have to go on a rehab."

Greinke did not bat, as Class A leagues use designated hitters. Mattingly said Greinke could be asked to bunt, but wasn't sure that would be necessary as Greinke has been hitting off a tee.

Greinke allowed two runs (one earned) in the first inning to the Storm, with Kral barely missing a two-run home run on a blast that hit high off the 25-foot wall in right field.

Batting in the third inning, Kral crushed a two-run homer to right-center, where the fence is only 15 feet high. In the fifth, Kral had an RBI double after shortstop Darnell Sweeney made back-to-back errors.

Greinke was injured on April 11 when he lowered his left shoulder to take the blow of Carlos Quentin, who charged the mound after behind hit by a Greinke pitch for the third time in his career.

When hit by the pitch, Quentin took a few steps and stopped. At that point Greinke reportedly said, "Save it," and Quentin dropped his bat and bull-rushed the pitcher. Quentin was suspended for eight games and later said he spoke with Greinke about the incident, but Greinke had no comment about their conversation.

The force of the blow on the shoulder created a significant fracture of Greinke's collarbone closer to the shoulder than the sternum. The fracture was repaired on April 13 with a metal plate and screws.