Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Francois-Xavier Bertras rides The Right Man to the finish line to win the fifth race. REUTERS/Ahmed Jadallah

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith who rodes Arrogate celebrates winning the ninth and final race. REUTERS/Stringer

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Riders compete in the final race. Image used for illustrative purpose

REFILE - CORRECTING BYLINE Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Francois-Xavier Bertras rides The Right Man to the finish line to win the fifth race. REUTERS/Stringer

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Joel Rosario rides Mind Your Biscuits to the finish line to win the sixth race. REUTERS/Ahmed Jadallah

REFILE - CORRECTING BYLINE Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Riders compete at the start of the fourth race. REUTERS/Stringer

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith riding Arrogate celebrates after winning the ninth and final race.

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Joao Moreira rides Vivlos to the finish line to win the seventh race. REUTERS/Stringer

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith rides Arrogate to the finish line to win the ninth and final race. REUTERS/Ahmed Jadallah

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Patrick Dobbs (R) rides Second Summer to the finish line to win the first race. REUTERS/Ahmed Jadallah

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith who rodes Arrogate celebrates winning the ninth and final race. REUTERS/Stringer

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Christophe Soumillon rides Thunder Snow to the finish line to win the Fourth race. REUTERS/Ahmed Jadallah

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith, who rode Arrogate, celebrates winning the ninth and final race. REUTERS/Ahmed Jadallah

Horse Racing - Dubai World Cup - Meydan Racecourse, Dubai - 25/3/17 - Mike Smith, who rode Arrogate, celebrates winning the ninth and final race. REUTERS/Ahmed Jadallah