134th Preakness Stakes

Rachel Alexandra works her way to the head of the field as they enter the first turn Saturday during the 134th Preakness Stakes at Pimlico Race Track.  (Al Bello / Getty Images)

Jockey Calvin Borel and Rachel Alexandra lead the field through the fourth turn at Pimlico Race Track on Saturday during the 134th Preakness Stakes.   (Matt Rourke / Associated Press)

Rachel Alexandra and jockey Calvin Borel lead the field into the homestretch on Saturday during the 134th Preakness Stakes at Pimlico Race Track. Kentucky Derby winner Mine That Bird (second from left) is in full stride trying to make up ground on the filly.  (Steve Helber / Associated Press)

Jockey Calvin Borel, who guided Mine That Bird to an upset victory in the Kentucky Derby, rejoices after riding Rachel Alexandra to a win in the Preakness Stakes on Saturday.   (Julie Jacobson / Associated Press)

Owner Jess Jackson celebrates in the Winner’s Circle on Saturday after Rachel Alexandra became the first filly in 85 years to win the Preakness Stateks.  (Matthew Stockman / Getty Images)