William Bloom. John T Behrendt, and Charles K. Marquis' two-time graded stakes winner Sharp Performance suffered career-ending injuries to both his front legs in Saturday's Fort Marcy Handicap (gr. IIIT) at Aqueduct. Trainer David Donk said Sunday that the injury is life threatening, but he remains hopeful the bay son of Kris S. can be saves for stallion duty."He has severe soft tissue damage in both front legs," Donk said. "We X-rayed him and there was no damage to his sesamoids. His class is starting to come out. He's been a good patient. I'm hoping we'll be able to fit him with braces. We've got a long way to go."Sharp Performance tracked Pyrus through most of the 1 1/16-mile race, then was pulled up by jockey John Velazquez while rallying to the lead in the stretch.The 4-year-old won four of seven career races, including the Lexington Stakes (gr. IIIT) and Lawrence Realization Handicap (gr. IIIT) last summer at Belmont Park. He also finished third in the Secretariat Stakes (gr. IT) at Arlington Park. The Fort Marcy was his first race this year."Good horses are hard to come by. ... It's a shame," said Donk. "I'm very upset."