ELMONT, N.Y. -- A quarter crack that has plagued City Zip throughout his 3-year-old season re-opened Saturday morning, forcing trainer Linda Rice to scratch him from the Riva Ridge Stakes.

Rice said she noticed there was heat in the colt's right front hoof when he came out of the stall Saturday morning.

"It's not real bad, but he's got a pulse and he was off on it," Rice said. "It is disappointing. The colt breezed great. I was excited to see the horse compete."

Rice said she was unsure how long City Zip would be out of action.

Burning Roma also scratched from the Riva Ridge. Trainer Tony Dutrow said he wanted to give the horse one more race around two turns. Burning Roma will run in Sunday's $200,000 Leonard Richards Stakes, a 1 1/16-mile race at Delaware Park.

"If I don't see what I want in that race then I could very easily turn him back in distance," Dutrow said.