Bob Baffert's Arkansas Shuttle keeps rolling, likely carrying a couple of his 3-year-old colts to the Kentucky Derby in less than seven weeks. The Hall of Fame trainer had another successful weekend at Oaklawn Park in Hot Springs, Ark., with Secret Circle winning the $500,000 Rebel Stakes by three-quarters of a length over fast-closing Optimizer on Saturday. The bay colt will return to California this week but is scheduled to be shuttled back for the $1 million Arkansas Derby on April 7 and shoot for an Oaklawn sweep. Secret Circle won the second division of the Southwest Stakes last month, and Baffert's Castaway won the first division. With Secret Circle's fifth win in six starts, the colt moves up to No. 4 on the Associated Press top-10 list of Derby contenders. Union Rags, Hansen and El Padrino remain 1-2-3 as they get ready for their final preps before the Derby on May 5. Bodemeister, second in the San Felipe Stakes on March 10 and headed next to the Santa Anita Derby on April 7, is No. 8. Castaway is set to run this weekend in the Sunland Derby. Also impressing last week was Gemologist, trainer Todd Pletcher's unbeaten 3-year-old who won an allowance race at Gulfstream Park Friday by seven lengths over Grade I stakes winner Currency Swap. Hall of Fame trainer D. Wayne Lukas may have a Derby contender in Optimizer, who just missed catching Secret Circle in the Rebel. Lukas is a four-time Derby winner, his last being Charismatic in 1999.