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The owner of a number of racehorses, the most notable of which was 2000 Kentucky Derby winner Fusaichi Pegasus whom he sold for a reported US$64 million to Ireland'sCoolmore Stud. Other successful thoroughbred horses Sekiguchi has owned include Tokyo Yushun winner Fusaichi Concorde and Fusaichi Pandora, winner of the 2006 Q.E. II Cup and dam of Almond Eye.
