A winner of 8 of 10 races, the almost-black colt could be retired from racing after his scintillating score in the Japan Cup.
Tokyo Racecourse
The race favourite Lemon Pop captured the February Stakes (G1) title; his dam is Canadian-owned Unreachable.
Trainer Roger Attfield has arrived in Japan to start Charles Fipke's Shirl's Speight, says how the horse handles dirt is an "unknown".
Grade 1 winner Shirl's Speight is expected to be the first international horse to compete in the Group 1 February Stakes at Tokyo Racecourse.
Undefeated son of American Pharoah went from 14th to 1st in a hand ride to get on the list of possible Kentucky Derby starters.
Woodbine Entertainment and the Japan Racing Association have partnered on a sponsorship agreement for the Canadian Stakes and Paradise Stakes.
