Breeders’ Cup: Aidan O’Brien becomes most successful trainer as son Donnacha claims first win

Ireland’s Aidan O’Brien has become the most successful trainer in Breeders’ Cup history with Gstaad’s emphatic victory in the Juvenile Turf.

Despite a tricky wide post in the one-mile race at Del Mar, near San Diego, Gstaad breezed past his rivals…

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