Serengeti Stable's Eugene's Third Son, runner-up in the Arkansas Derby (gr. III) and the Lane's End Stakes (gr. II), underwent surgery Monday to remove a broken splint bone and will not run in either the Kentucky Derby (gr. I) or the Preakness Stakes (gr. I).Trainer Patrick Byrne had said the Indian Charlie colt was being pointed toward the Preakness, but a run in the Derby remained an option. But prospects for Eugene's Third Son to run in either race evaporated late Monday morning when the fractured splint bone was discovered on the inside of the colt's right front leg. He underwent surgery at Dr. Bill Baker's clinic in Versailles, Ky. on Monday afternoon, one day after the colt had returned from Oaklawn Park."On Sunday he was fine, but on Monday we pulled the bandage off and he had a little swelling," said Byrne. "We X-rayed it and it revealed a little fracture."Byrne said the surgery went well and that Eugene's Third Son should be back in action for the Saratoga meet."I felt like we were a remote possibility for the Derby," said Byrne, "and the Preakness was a definite - but that's off."Byrne is now hoping Eugene's Third Son can return to competition in time to try the King's Bishop (gr. I) at Saratoga with an ultimate goal of a run in the Breeders' Cup Sprint (gr. I). "Dr. Baker said we've got an excellent prognosis," he said. "We'll re-evaluate in 30 days, but he said he didn't see why, with normal healing, he can't be back under tack and jogging in five or six weeks."Eugene's Third Son has a career record of 2-3-0 in five races.