DEL MAR, California--In Saturday's GI Maker's Mark Breeders' Cup Filly & Mare Turf at Del Mar, the Europeans come to town riding a five-year win streak having taken the hardware and the bragging rights with thanks. Yet, lest we forget that this is horse racing on the turf and that means even the most deserving favorites can be vulnerable. To put it in sports betting terms, the Filly & Mare Turf could be deemed what we call a 'trap game' in the business. That means a seemingly stronger opponent underestimates...