Frankie Dettori rides Blue Bunting home to win the Qipco 1000 Guineas Stakes at Newmarket racecourse on May 01, 2011 in Newmarket, England. (Photo by Alan Crowhurst/Getty Images Europe)

Frankie Dettori dismounts Blue Bunting after winning the Qipco 1000 Guineas Stakes at Newmarket racecourse on May 01, 2011. (Photo by Alan Crowhurst/Getty Images)

In this photo provided by New York Racing Association, Caixa Eletronica, ridden by Cornelio Velasquez captures The Westchester Gr.III at Belmont Park on April 30, 2011, in New York.

Dubawi Heights and jockey Joel Rosario, second from left, pull away from Lilly Fa Pootz (Mike Smith), left, Miss Pleasant (Chantal Sutherland), third from left, and Burg Berg (Martin Pedroza), right, to win the Grade III, $100,000 Wilshire Handica, Saturday, April 30, 2011, at Hollywood Park in Inglewood, Calif. (AP Photo/Benoit Photo)

Jockey Edgar Prado is all smiles after guiding Machen to a come-from-behind victory in the 87th running of the Derby Trial on opening night at Churchill Downs in Louisville, Ky., Saturday, Apr. 30, 2011. (AP Photo/Garry Jones)

Pocket Patch, making his first start since early October, wins his second straight stakes for jockey Jonathan Joyce and trainer Flint Stites in the $75,000 Henry S. Clark Stakes.  (Photo by Jim McCue/MJC)

In this photo provided by Benoit Photo, Saint Isabelle, ridden by Rafael Bejarano, goes on to win the Time To Leave Stakes at Hollywood Park on Sunday, May 1, 2011, in Inglewood, Calif.