Jockey Kyle Kaenel sustained a broken collarbone in a two-horse spill Sunday at Fairplex Park. The other rider involved, Alonso Quinonez, was not seriously hurt and returned to win the next race.\nKaenel was riding Sheval Dom Sallay in race 8 when the 2-year-old maiden clipped heels and unseated Kaenel. Quinonez's mount Mikeswayorthehiway, who was trailing the incident, was unable to avoid the fallen horse and unseated Quinonez.\nAccording to his agent, Jeff Metz, Kaenel was taken by ambulance to nearby Pomona Valley Hospital Medical Center where X-rays confirmed he had broken a collarbone. Kaenel was released Sunday night and was scheduled for further medical examination on Monday.\nKaenel, the 21-year-old son of son of Cowboy Jack Kaenel, began riding in Southern California during the summer meet at Del Mar. After a slow start, he picked up momentum at Fairplex with wins on Sept. 23 and 24. He was named to ride three horses on opening day of the Oak Tree meet at Santa Anita. Kaenel has been riding since fall 2004.