Lexie Lou, with jockey Patrick Husbands aboard, won the 155th running of The Queen's Plate at Woodbine Racetrack in Toronto on Sunday.
The Woodbine Oaks winner, the 3/1 second choice, covered the 1 1/4-mile race in an unofficial time of 2:03.94 on the polytrack at Woodbine Racetrack to earn trainer Mark Casse his first-ever Plate victory.
Ami's Holiday finished second in the 15-horse field, with Asserting Bear taking third in Canada's most prestigious race.
We Miss Artie, the 9/5 favourite, was fourth.
The second jewel of the Canadian Triple Crown is the $500,000 Prince of Wales Stakes, which will go July 29 at Fort Erie Racetrack.
Husbands rode Lexie Lou to victory at the Woodbine Oaks on the same track just under a month ago.
The three-year-old is trained by Mark Caisse and owned by Gary Barber, the chairman and CEO of MGM.