Toby’s Corner, the Thoroughbred colt who handed possible Derby favorite Uncle Mo his only career loss in the Resorts Casino New York Wood Memorial, has been withdrawn from the May 7 Kentucky Derby Presented by Yum! Brands, taking place at Churchill Downs in Louisville, Ky.

Late on May 2, trainer H. Graham Motion noticed the colt was off in his left rear leg and Toby’s Corner was sent to the University of Pennsylvania’s New Bolton Center in West Chester, Pa., to be examined. The colt spent the night at New Bolton, but all the tests proved negative. He returned to Motion’s farm near Fair Hill, Md., early on May 3.

Officials at Churchill Downs said May 3 that additional details would be provided later as to why Motion withdrew the colt. Toby’s Corner was scheduled to ship Churchill Downs May 3.

A homebred for Julian and Dianne Cotter, Toby’s Corner is out of the Mister Frisky mare Brandon’s Ride. He has a 4-0-2 record from six starts and has earned $722,240. In addition to the Wood Memorial, Toby’s Corner won the Whirlaway Stakes at Aqueduct Race Track in Jamaica, N.Y., on Feb. 5. Between stakes victories he ran third behind Derby contender Stay Thirsty in the one-mile Gotham Stakes March 5