ARCADIA, Calif. — Jockey Corey Nakatani most likely will miss next month's Breeders' Cup because of a broken collarbone from a spill at Santa Anita.

His mount, Easy on the Eye, went down after clipping heels shortly after the start of the $100,000 Morvich Handicap on Wednesday's opening day of the track's Oak Tree meeting.

"It's a new injury and a clean break," his agent, Ron Ebanks, said. "Doctors ... will see him in three weeks for further evaluation, but he's expected to be out from three to five weeks."

In January, Nakatani broke his right clavicle in a training accident at Hollywood Park.

The 37-year-old rider was replaced on seven scheduled mounts Saturday, including Vacare in the $400,000 Yellow Ribbon Stakes, In Summation in the $250,000 Ancient Title Stakes and Spring House, who finished fourth in the $250,000 Clement L. Hirsch Turf Championship.

Nakatani was the leading rider at the 2006 Oak Tree meeting.

The Breeders' Cup will be run Oct. 24-25 at Santa Anita.