Olympic three-day event champion Leslie Law has played down talk he can repeat Great Britain team-mate Pippa Funnell's feat and win the sport's Grand Slam. Funnell made history in 2003 when she became the first rider to win Kentucky, Badminton and Burghley in one season.
But Law, who will be GB's only elite rider in action when Kentucky starts on Thursday, told BBC Sport: "I'm not sure the slam will ever be done again.
"What Pippa did was phenomenal. You need an awful lot to go right."
Law partners Coup de Coeur in Lexington from 28 April-1 May, the horse he guided to 12th in 2004's World Cup finals.
 | It will be a real thrill to ride both the greys at Badminton |
The Worcestershire-based star has a decent record at the US competition, finishing fifth in 2003 and seventh in 2002.
After Kentucky, Law returns to the UK to tackle the second Slam event - Badminton Horse Trials, from 5-8 May.
Law plans to compete on both both Shear L'Eau and his full brother Shear H20 at the Gloucestershire Park event.
"It is going to be a very hectic two weeks," said Law, who opened his 2005 campaign with first place at Tweseldown on Shear L'Eau.
Law rode L'Eau to individual gold and team silver at last summer's Athens Games.
"It will be a real thrill to ride both the greys at Badminton and having finished second and third there on Shear H20 it would be great to win it this year."
Victory at both Kentucky and Badminton would put Law in line for a $250,000 Grand Slam bonus, which he would clinch by winning Burghley in Stamford, Lincolnshire, in September.
Funnell has opted not to ride in Lexington this year and instead focus on her preparations for Badminton.