Roy and Gretchen Jackson's Showing Up, who finished a solid third the Sept. 9 Man o' War Stakes (gr. IT) , will make his next start in Saturday's $200,000 Jamaica Handicap (gr. IIT) for 3-year-olds at Belmont Park, and likely will skip the Breeders' Cup World Championships, trainer Barclay Tagg said Monday."I just think the Breeders' Cup is too tough right now," Tagg said. "Of course, if he wins the Jamaica impressively, the owners could change their mind and go to the Breeders' Cup, but they usually leave those decisions up to me."He's just a 3-year-old, and I don't want to get greedy. If he had won the Man o' War, we would have considered the Breeders' Cup, but finishing third is not going to do him any good. And if we ran in the mile and a half race (John Deere Breeders' Cup Turf, gr. IT) it could knock him out for a while. My experience tells me that it's not the right thing to do. If he wins the Jamaica, we could run him in the Hollywood Derby (gr. IT), and then have a strong horse for next year."Showing Up captured the Coolmore Lexington Stakes (gr. II) on dirt before switching to the grass, where he won the Colonial Turf Cup and Secretariat Stakes (gr. IT).