Prove Out

Prove Out was a chestnut horse bred by King Ranch. During his racing career he was trained by H. Allen Jerkens. Prove Out's dam Equal Venture, was a sister of the Triple Crown winner Assault and the granddam of the Eclipse Stakes winner Solford.[2]

In the 1973 Woodward, Prove Out, at odds of 16:1, upset odds-on favorite Triple Crown champion Secretariat by 41⁄2 lengths, while conceding 7 pounds to the eventual 1973 Horse of the Year.[3] Prove Out also defeated Secretariat's stablemate, the 1972 Kentucky Derby winner and 1973 U.S. Champion Older Horse Riva Ridge, in the 1973 Jockey Club Gold Cup.[4]

In addition to his two memorable victories in 1973, Prove Out also ran track record times at Saratoga for 7 furlongs (1:21), and at Belmont Park for 11⁄16 miles (1:402⁄5). His Woodward Stakes time of 2:254⁄5 for 11⁄2 miles on an off track is the second fastest performance ever recorded for that distance at Belmont Park, behind only Secretariat's 2:24 record Belmont Stakes win.[1] Prove Out's winning performance in the 2 mile Jockey Club Gold Cup was timed in 3:20, bettered in American racing only by the great Kelso. In a span of two months Prove Out decisively defeated four Hall of Fame horses: Forego, Secretariat, Cougar II, and Riva Ridge.[1]

Prove Out would go on to win one other stakes race, the 1974 Grey Lag Handicap.

Prove Out was the broodmare sire of the champion filly Miesque.[4]