BALTIMORE, JULY 27 -- Apprentice jockey Brad Roberson received 18 stitches in his left ear as a result of a third-race spill at Pimlico in which he was struck by a horse.

Roberson had Harraz on the outside entering the stretch when his colt broke down and began striding aimlessly. He kept Harraz upright before dismounting to the colt's left; however, he landed in front of the trailing Sprizzo, leaving Chris DeCarlo no chance to steer around the fallen rider. Sprizzo appeared to strike Roberson on the left side as he passed.

Harraz, a 4-year-old who had won one of nine starts before the race, was destroyed.

It was the second straight day in which Roberson went down in a race. On Thursday, Devil's Oceanette fell as Roberson moved her off the rail deep into the far turn, less than half a furlong from where Harraz found tragedy.

Roberson, 21, was taken to Sinai Hospital for stitches and treatment to his cut left shoulder. Tests showed no internal injuries, according to Joe Burdo, his agent, who said Roberson probably won't ride until next week.

Today's incident cost Roberson only one mount, but this is a critical time for him. Mark Johnston became a journeyman Thursday, leaving Roberson as Maryland's most-used apprentice. However, he's facing more and more competition, and two newcomers look particularly promising: Shawn Payton, who arrived from the Midwest, and Mark Rosenthal.

Rosenthal, 17, showed tact and courage in his first career mount today. Stolen Trust, his fifth-race mount, was pinned on the rail by front-running Noble Landing in the stretch, but Rosenthal continued to push his mount aggressively despite a lack of room. He finally eased up after the two horses bumped near the wire, Stolen Trust finishing only 2 1/2 lengths back in sixth.

"I wasn't worried at all," said Rosenthal, the son of Maryland agent Lou Rosenthal. "I was just looking to get through there."

Joe Rocco rode three winners for the second straight day, putting him three ahead of Johnston after the first two days of the meet.