SARATOGA SPRINGS - The nation's leading jockey, Joel Rosario, did not ride Kentucky Derby winner Orb in Saturday's 144th Travers Stakes after suffering a broken left foot Friday in a spill.

Orthopedist Rick Alfred, one of the New York Giants' team physicians, fitted him with a cast, and Rosario is expected to be sidelined six weeks.

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He was unseated when last-place finisher Casual Elegance stumbled after passing the wire in Friday's seventh race on Saratoga's inner turf course.

Trainer Shug McGaughey named Jose Lezcano to replace Rosario on Orb in the $1-million Midsummer Derby. Rosario, a 28-year-old native of the Dominican Republic, also was scheduled to ride Game On Dude, one of the nation's top older horses, for trainer Bob Baffert in Sunday's $1-million Pacific Classic at Del Mar.