Groupie Doll stretched her unbeaten run to five races with a spellbinding victory in the Breeders' Cup Filly & Mare Sprint at Santa Anita.
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The William Bradley-trained four-year-old was a class apart under Rajiv Maragh, who breezed past Dust And Diamonds a furlong and a half from home and won with the minimum of assistance.
Bradley's filly made encouraging progress along the back straight as Teddy's Promise cut out much of the running at a generous pace.
Dust And Diamonds enjoyed her moment in the sun when she took the lead rounding the bend, but it soon became quite clear Groupie Doll was not for stopping.
Maragh said of the 4/6 favourite: "She's one of the best I've ridden and always gives so much in her races.
"I don't think she's ever been better than she was today."
Bradley said: "It's great to be here winning at the World Championships.
"It's particularly pleasing for my father, who bred her.
"It's pretty special."