She improved to 3 for 3 on the turf here, including the 2011 Breeders' Cup Juvenile Turf Fillies.
Lost in the hoopla can be the race that takes place the day before, the one for three-year-old fillies.
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But as Midnight Lucky began to tire, she was overtaken by Beholder, last year's Breeders' Cup Juvenile Fillies champion.
His first crop of progeny, which included the Breeders' Cup Juvenile Fillies champion Stardom Bound, quickly increased his value.
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At the start of June comes the Derby, for colts, and the Oaks, for fillies, over a mile and a half.
It will see a programme of seven top races in five categories - sprint, mile, middle distance, fillies and mares and long distance.
And the three-year-old rounded the season off in style with victory in the Fillies and Mares Turf race at the Breeders' Cup in Texas.
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Outside of the Derby and the Oaks (the fillies-only race that takes place the day before the Derby), most of the racing here is low-grade.
So why have the owners of some of the world's most valuable fillies, and a wide segment of the industry, chosen to breed to him?
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The Classics -- the top races for three-year-old thoroughbreds -- begin with the 1, 000 Guineas for fillies and the 2, 000 Guineas for colts in early May.
Women are few and far between at most tracks, and some of the better-known tracks have begun to try to cultivate a female fan base, often anchored to a significant race for fillies or mares.
It continued the O'Briens' domination of the English flat racing season, having already captured the 1, 000 Guineas with Homecoming Queen, the 2, 000 Guineas with Camelot and the Oaks (for fillies) with Was at Epsom on Friday.
After a somewhat fractious start in which several of the fillies appeared to become unsettled by the atmosphere on course, an early break-neck pace was set by David Simcock's Miss You Too, who appeared to taking a keen hold with jockey Ian Mongan.
Godolphin's Certify, unbeaten in four career outings and winner of the Shadwell Stud Fillies' Mile at Newmarket last September, was one of the horses to test positive and will not be allowed to take part in the 1, 000 Guineas at Newmarket next month.
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