Bobby Frankel's wealth of top-class older horses will get even wealthier when he takes over the training of 2000 champion 2-year-old Macho Uno in May.The son of Holy Bull, who captured the 2000 Breeders' Cup Juvenile, has had an injury-plagued career, but still has managed to win the Pennsylvania Derby at 3 and the Massachusetts Handicap at 4. After finishing fifth in last year's Breeders' Cup Classic, it was discovered the colt had a slight filling behind his knee, which eventually cleared up on its own."We just decided to stop on him and give him more time," said Danny Vella who manages owner Frank Stronach's farm in Ocala, where Macho Uno has been since the Breeders' Cup. "He's back in training now, and Frank wants him to have a summer and fall campaign. We still feel he's a great horse, and we hope that by having a short, concentrated campaign this time, he'll be able to return to his championship form.."Vella said Macho Uno, who previously was trained by Joe Orseno, is scheduled to ship to Frankel's barn at Belmont Park immediately after the Kentucky Derby. This will give Frankel a powerful one-two punch for Stronach, who also owns two-time Santa Anita Handicap winner Milwaukee Brew.