Jockey Kyle Frey is expected to miss two or three weeks of racing after a pre-race spill July 27 at Del Mar.
Frey's agent Bill Sadoo said July 28 the jockey sprained his left knee when he was unseated by Beat the Chalk before the last race Friday, a maiden claiming race. Beat the Chalk was scratched from the one-mile dirt race and Frey was attended to by paramedics and transported off the track in an ambulance.
Sadoo said Frey will undergo "further testing" next week.
The champion apprentice jockey of 2011, a year he won 153 races and $4,053,549 while based in Northern California and Pennsylvania, Frey moved his tack to Southern California in 2017. His second-best season came in 2016, when he won 147 races and earned more than $2 million in purses, when he raced entirely in Northern California.
Frey was winless in 15 mounts in the first two weeks of the summer meet at Del Mar, but has earned more than $1 million in purses from 20 victories this season, including graded stakes scores aboard Blended Citizen in the Jeff Ruby Steaks (G3) at Turfway Park and the Peter Pan Stakes (G3) at Belmont Park for trainer Doug O'Neill. He also won a pair of grade 3 races in 2017 with Shane's Girlfriend in the Iowa Oaks and Zakaroff in the El Camino Real Derby.