08/12/2010 6:02PM

Del Mar: Valenzuela excused from rides

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Jockey Patrick Valenzuela was excused from his final four mounts on Thursday's program after straining a knee during the fourth race.

Valenzuela told track officials he aggravated his knee when pulling up Big Wig, who was vanned off after the one-mile turf race for $40,000 claimers. Big Wig was reported to be off in his right foreleg, according to track stewards.

Silent Soul ($13.60) won the race in his first start since being claimed for $32,000 on July 21. Both Big Wig and Silent Soul are trained by Doug O'Neill.

Valenzuela's place aboard Warren's Extrasilk in the fifth race was taken by Alonso Quinonez. David Flores will ride Ducane in the seventh race.