Jockey Gary Stevens will not ride Cee Sam's Girl (10) in Sunday's sixth race after complaining of back pain after he was unseated in the post parade of the fifth race.

Cee Sam's Girl will be ridden by Kyle Frey.

Stevens rode Mobou to a third-place finish in the fifth race for 2-year-old maidens. After the race, Stevens moved slowly toward the scales and then rested briefly on a bench near the paddock.

He walked gingerly back to the jockey's room. 

"It knocked the wind out of me," he said of the pre-race incident. "I'm not feeling too good this second."

Stevens was booked to ride the final two races. No replacement riders were immediately named.