DEL MAR, Calif. – Zapperkat, who was disqualified from first to second in Sunday’s Grade 3 Torrey Pines Stakes at Del Mar, has run her last race. Trainer Richard Baltas said Wednesday that Zapperkat emerged from the Torrey Pines with a knee injury. The 3-year-old filly underwent a knee operation last year that led to a lengthy layoff. “I think we’ll retire her,” Baltas said. “She’s had a surgery on a knee. She’s a good horse and has broodmare value.” Owned by J K Racing and Bruce Chandler, Zapperkat won by a head in the $100,690 Torrey Pines Stakes for 3-year-olds fillies at a mile, but was disqualified for bumping twice with runner-up Munny Spunt in the final furlong. Zapperkat, by Ghostzapper, won 2 of 5 starts and earned $128,520. She finished third in the Grade 1 Chandelier Stakes at 2 last October at Santa Anita, but was sidelined after that race with an injury that kept her from an intended start in the Breeders’ Cup Juvenile Fillies.