Nanako Fujita, the Japan Racing Association's first female jockey in 16 years, is day-to-day after being injured in a fall on Saturday.
In her first ride at Tokyo Racecourse, 18-year-old Fujita fell coming off a turn after her mount made contact with another horse. She immediately got back up on her feet, but complained of pain in the arm.
Fujita was diagnosed with damage to her triceps as well as bruising to the head. She canceled her remaining six scheduled rides on the day, and will wait to see about her eight mounts on Sunday.
"I feel terribly sorry for the fans who bet on me," Fujita said. "I hope I can learn from this mistake for my races in the future."