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Katharina Dietrich from Germany dressed up with horse decorations attends the Dubai World Cup horse race at Meydan Racecourse in Dubai, United Arab Emirates, Saturday, March 29, 2014. Ruler of the World could live up to his name in the $10 million Dubai World Cup when he starts as the 9-2 favorite at Meydan Racecourse on Saturday. (AP Photo/Kamran Jebreili) ( Mideast Emirates Dubai World Cup Horse Race )

Toast of New York ridden by Jamie Spencer wins the UAE Derby during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481285017 )

MARCH 29: Race goers are pictured during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481270011 )

Race goers are pictured during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481269955 )

Guests arrive at the Meydan race track before the start of the Dubai World Cup, the world's richest horse race with a prize money of 10 million US dollars, on March 29, 2014. (KARIM SAHIB/AFP/Getty Images) ( 528472206 )

African Story ridden by Silvestre De Sousa wins the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481314801 )

Silvestre De Sousa, riding African Story from Britain, celebrates after winning the world's richest horse race Dubai World Cup at Meydan racecourse in Dubai, United Arab Emirates, Saturday, March 29, 2014. (AP Photo/Kamran Jebreili) ( Mideast Emirates Dubai World Cup Horse Race )

Jockeys compete in the Dubai Sheeba Classic race held on Dubai World Cup day on March 29, 2014 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (MARWAN NAAMANI/AFP/Getty Images) ( 528480053 )

Irish jockey Jamie Spenser (R) celebrates on Toast of New York after winning the UAE Derby race held on Dubai World Cup day on March 29, 2014 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (KARIM SAHIB/AFP/Getty Images) ( 528475957 )

Japanese jockey Yuichi Fukunaga on his horse "Just A Way" celebrates after winning the Dubai Duty Free race held on Dubai World Cup day on March 29, 2014 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (MARWAN NAAMANI/AFP/Getty Images) ( 528479411 )

Sheikh Hamdan bin Mohammad bin Rashid al-Maktoum, Crown Prince of Dubai, looks at his father's horse, African Story, after it won the Dubai World Cup, the world's richest horse race, at the Meydan race track in the Gulf Emirate on March 29, 2014. A cosmopolitan gathering of horses from seven different countries contested the US$10 million Emirates Dubai World Cup. (KARIM SAHIB/AFP/Getty Images) ( 528481841 )

Guests pose for a photograph as others arrive at the Meydan race track before the start of the Dubai World Cup, the world's richest horse race with a prize money of 10 million US dollars, on March 29, 2014. (KARIM SAHIB/AFP/Getty Images) ( 528472208 )

Race goers are pictured during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481269997 )

A woman attends the Dubai World Cup horse race at Meydan Racecourse in Dubai, United Arab Emirates, Saturday, March 29, 2014. Ruler of the World could live up to his name in the $10 million Dubai World Cup when he starts as the 9-2 favorite at Meydan Racecourse on Saturday. (AP Photo/Kamran Jebreili) ( Mideast Emirates Dubai World Cup Horse Race )

Jockeys compete in the al Quoz Sprint race held on Dubai World Cup day on March 29, 2014 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (MARWAN NAAMANI/AFP/Getty Images) ( 528477261 )

Gentildonna riden by Ryan Moore wins the Dubai Sheema Classic during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481319609 )

Racegoers are pictured during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Francois Nel/Getty Images) ( 481269897 )

Olivier Peslier of France riding on Rabbah De Carrere celebrates after he wins the Kahayla Classic, a race held during the Dubai World Cup horse races at Meydan Racecourse in Dubai, United Arab Emirates, Saturday, March 29, 2014. (AP Photo/Kamran Jebreili) ( Mideast Emirates Dubai World Cup Horse Race )

Jockeys compete in the Dubai Kahayla Classic race held on Dubai World Cup day on March 29, 2013 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (MARWAN NAAMANI/AFP/Getty Images) ( 528473911 )

Brazilian jockey Joao Moreira on Amber Sky competes before winning the al Quoz Sprint race held on Dubai World Cup day on March 29, 2014 at Meydan racecourse in Dubai. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup at Meydan racecourse. (MARWAN NAAMANI/AFP/Getty Images) ( 528477220 )

Race goers are pictured during the Dubai World Cup at the Meydan Racecourse on March 29, 2014 in Dubai, United Arab Emirates. (Photo by Warren Little/Getty Images) ( 481269979 )

Sheikh Mohammad Bin Rashid al-Maktoum, ruler of Dubai, spins the golden whip as he celebrates after his horse African Story won the Dubai World Cup, the world's richest horse race, at the Meydan race track in the Gulf Emirate on March 29, 2014. A cosmopolitan gathering of horses from seven different countries contested the US$10 million Emirates Dubai World Cup. (MARWAN NAAMANI/AFP/Getty Images) ( 528481263 )

Brazilian jockey Joao Moreira celebrates after winning the Dubai Golden Shaheen race on the horse Sterling City during the Dubai World Cup at the Meydan race track in the Gulf Emirate on March 29, 2014. A cosmopolitan gathering of horses from seven different countries contest the US$10 million Emirates Dubai World Cup. (KARIM SAHIB/AFP/Getty Images) ( 528478366 )