1. The Dubai World Cup

Irish-born, US-based Eoin Harty (L) receives his trophy from Emirati Vice President and Dubai ruler Sheikh   Mohammed bin Rashed al-Maktoum after his contender Well Armed won the 6-million-dollar Dubai World Cup race in   the Gulf emirate on March 28, 2009. Well Armed improved from third last year to run out the easy winner of the   Dubai World Cup, the world's richest race. Trained by Harty, Well Armed led from start to finish to ease home   ahead of French runner Gloria de Campeao. AFP PHOTO/KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty   Images)There’s no disputing the richest horse race on the planet. Every year The United Arab Emirates hosts the Dubai World Cup, a race that attracts a selection of the finest 4 year old and older racehorses in the Northern Hemisphere, as well as a smattering of 3 year old and older talent from the Southern Hemisphere. The 2 000 meter race over dirt awards a purse of $6 million.

2. Prix de l’Arc de Triomphe

PARIS - OCTOBER 05: Christophe Soumillon waves after winning the Qatar Prix de l'Arc de Triomphe with Zarkava on   October 05, 2008 in Longchamp, France. (Photo by Pascal Le Segretain/Getty Images)The Prix de l’Arc de Triomphe offers the second largest purse in thoroughbred racing. Run over a distance of 2 400 metres, the race brings together the finest thoroughbred talent from the United Kingdom, Ireland and continental Europe. The Prix de l’Arc de Triomphe rewards horses that place handsomely with a purse of €4 million (around $5,4 million), which is shared between the top five finishers.

3. The Breeders’ Cup Classic

ARCADIA, CA - OCTOBER 25: Jockey Garrett Gomez celebrates atop Midnight Lute as he crosses the finish line to   win the Sentient Flight Group Breeder's Cup Sprint race during the Breeders' Cup World Championships at Santa   Anita Park October 25, 2008 in Arcadia, California. (Photo by Matthew Stockman/Getty Images)The Breeders’ Cup constitutes another of the world’s richest horse races. The race is run over a distance of 1½ miles by a collection of the finest 3 year old and above thoroughbred races on the planet. Success in the race generates significant rewards, with $3 million in prize money on offer for the second biggest race at the Breeders’ Cup meeting.

6. The Hong Kong Cup

HONG KONG - DECEMBER 09: The field in the Cathay Pacific Hong Kong Cup race past the finish post the first time   during the Cathay Pacific Hong Kong International Races at Sha Tin Racecourse December 9, 2007 in Hong Kong.   (Photo by Mark Dadswell/Getty Images)The Hong Kong Cup is Asia’s answer to the Epsom Derby and the Kentucky Derby. Run over a distance of 2000m by Asia’s finest 3 year old and above thoroughbred racehorses, the Hong Kong Cup doesn’t slouch when it comes to gargantuan payouts, and tosses up a $2,5 million purse for the top performers in the race.

7. The Rest of the Breeders’ Cup

ARCADIA, CA - OCTOBER 25: Horses break from the gate to start the Breeders' Cup Classic during the Breeders' Cup   World Championships at Santa Anita Park October 25, 2008 in Arcadia, California. Frankie Dettori atop Raven's   Pass (3rd from the left) won the Classic. (Photo by Christian Petersen/Getty Images)There’s no competing with the Breeder’s Cup when it comes to enormous prize funds. Rated as being the single richest sports event in the world, the Breeders Cup awards well over $20 million in prize money for races run over the course of the two-day event. Whilst the Classic and Turf pay out the biggest prizes at the meeting, six other races pay out purses worth $2 million.

8. The Kentucky Derby

LOUISVILLE, KY - MAY 02: The field starts the 135th running of the Kentucky Derby on May 2, 2009 at Churchill   Downs in Louisville, Kentucky. (Photo by Andy Lyons/Getty Images)There’s more to Kentucky than its famous fried chicken. Every year the finest three year old thoroughbreds in North America gather to run in the Kentucky Derby, the opening race of the American Triple Crown of thoroughbred racing. The 1¼ mile race is the richest in the Triple Crown series, paying out $2 million in prize money.

9. The Irish Derby

DUBLIN, IRELAND - JUNE 29: Tax Free ridden by Adrian Nicholls lands the William Fry Sapphire Stakes race run at   The Curragh Racecourse on June 29, 2008, at The Curragh, Ireland. (Photo by Julian Herbert/Getty Images)Irish thoroughbred racing is no longer the poor second cousin of the racing that takes place across the Irish seas. The Irish Derby, Ireland’s answer to the Epsom Derby, is one of the richest races in the world, and by far the richest on the Emerald Isle. Every year the 1 mile 4 furlong race awards a purse of €1.5 million – approximately $2 million.

10. The Epsom Derby

EPSOM, UNITED KINGDOM - JUNE 07: New Approach heads up to the finish line to win the Epsom Derby during the Epsom Derby on June 7, 2008 in Epsom, England. (Photo by Chris Jackson/Getty Images)Few thoroughbred races can rival the Epsom Derby when it comes to heritage and prestige. The richest of the five English Classics, the Epsom Derby is not only a horse race but also a cultural institution. The 1 mile 4 furlong Derby rewards its participants handsomely with a purse of £1.25 million (approximately $1,8 million), which is up for grabs in the race.

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