T M Opera O (Japanese : テイエムオペラオー, March 13, 1996 - ) was a Japanese thoroughbred racehorse, sired by Opera House, a son of Sadler's Wells, out of Once Wed, a daughter of Blushing Groom. T.M. Opera O was inducted into the Japan Racing Association Hall of Fame in 2004.T.M. Opera O was the world's all-time leading money-earner. He won 1,835,189,000yen($14,100,000, $1 = 130yen) during his career. 1999 Best Three-year-old Colt 2000 Japanese Horse of the Year and Best Older Colt or Horse