Victoire Pisa finished a disappointing 13th in his first start since winning the Dubai World Cup in March as Buena Vista romped to victory in the 2,400-metre Japan Cup on Sunday.
Buena Vista, the 2010 Group 1 Dubai Sheema Classic runner up, was guided home by Yasunari Iwata to complete a 1-2-3 finish for Japanese horses.
The five-year-old mare caught the front-running Tosen Jordan in the last 100 metres to win in two minutes 24.2 seconds.
"Buena Vista showed her strength today," Iwata said. "She proved she is the strongest horse right now. I hadn't won a race with her before, so I'm really happy that we made the best running to win today."
Jaguar Mail was third, one-and-three-quarters lengths further back at Tokyo Racecourse.
Danedream, the Prix de l'Arc de Triomphe champion, finished sixth. Victoire Pisa's failure to challenge the leaders meant Mirco Demuro lost for the first time with the four-year-old colt.