(CNN) — Orb won the 139th running of the Kentucky Derby on Saturday.
More than 151,000 spectators packed Churchill Downs in Louisville, where rain muddied the track.
The Derby is the first jewel of the Triple Crown. The 138th running of the Preakness, on May 18 in Maryland, is the second, followed by the Belmont Stakes, in New York on June 8.
Only 11 horses have won the crown, none since Affirmed did so in 1978.