Bachelor Duke is an American-bred, British-trained Thoroughbred racehorse and sire who recorded his only win in six races when taking the 2004 running of the Irish 2000 Guineas. He failed to win as a two-year-old in 2003 but showed very promising form by finishing third in the Somerville Tattersall Stakes and fourth in the Dewhurst Stakes. In the following spring he finished seventh in the 2000 Guineas but then defeated a strong field to win the Irish 2000 Guineas from Azamour and Grey Swallow. He finished unplaced in the St James's Palace Stakes on his only subsequent start and was retired from racing at the end of the season. He stood as a breeding stallion in Ireland and New Zealand and had considerable success as a sire of winners in the latter country.
Bachelor Duke made his racecourse debut in a maiden race over seven furlongs at Yarmouth Racecourse on 17 September and started at odds of 100/30 second favourite in a fifteen-runner field. After being restrained by Sanders in the early stages he stayed on in the last quarter mile to finish third behind Eden Rock and Dubois. Despite his defeat the colt was moved up in class for the Group Three Somerville Tattersall Stakes over the same distance at Newmarket on 2 October. He started the 25/1 outsider of the eight runners but exceeded expectations as he finished strongly to take third place behind Milk It Mick and the favourite Bayeux, beaten half a length by the winner. He was again an outsider sixteen days later when he was stepped up to Group one level for the Dewhurst Stakes. After being held up as usual he recovered from being blocked approaching the final furlong to finish fourth of the twelve runners behind Milk It Mick, Three Valleys and Haafhd.
2004: three-year-old season
Bachelor Duke began his second season in the 2000 Guineas over the Rowley Mile course at Newmarket on 1 May. Starting at odds of 20/1 in a fourteen-runner field he raced closer to the lead than previously but was unable to quicken in the last quarter mile and cam home seventh, beaten six lengths by Haafhd, who won from Snow Ridge, Azamour and Grey Swallow. Following the death of the Duke of Devonshire on 3 May the ownership of Bachelor Duke passed to the executors of his late owner's estate. Three weeks after his defeat at Newmarket the colt was sent to Ireland for the Irish 2000 Guineas over one mile on good to firm ground at the Curragh. Azamour stated 6/4 favourite ahead of Grey Swallow and Leitrim House with Bachelor Duke next in the betting on 12/1. The only one of the other four runners to be given a serious chance was the Aidan O'Brien-trained Grand Reward. He raced in sixth place as Grand Reward set the pace, before being switched to the outside to make his challenge two furlongs out. He went to the front 100 yards from the finish and won by a length from Azamour with Grey Swallow taking third ahead of Leitrim House. He became the first maiden to win the race since Ballymore in 1972. After recording the first classic success of his 25-year training career James Toller said " a long time coming, but fantastic. It's just such a shame the owner couldn't be here to see it. It looked like he'd improved from the Guineas. He's been working well at home and the faster ground helped". Seb Sanders, who was also winning his first classic commented "It's a fantastic feeling. I rode my first Group One winner in the same colours and it is a shame the Duke did not live long enough to see this day". In the St James's Palace Stakes at Royal Ascot in June. In the St James's Palace Stakes at Royal Ascot in June he was given a little more respect in the betting market and started the 6/1 third favourite behind Azamour and Haafhd. After racing in mid-division he was unable to make any progress in the straight and finished seventh of the eleven runners behind Azamour.
Assessment
In the 2003 International Classification for two-year-olds Bachelor Duke was given a rating of 114, making him the thirteenth-best European juvenile colt of the year, seven pounds behind the top-rated Bago. In the 2004 World Thoroughbred Racehorse Rankings Bachelor Duke was rated at 118, making him the forty-first best horse in the world.
Stud career
Bachelor Duke was retired from racing at the end of the 2004 season and began his career as a breeding stallion in 2005 at the Ballylinch Stud in Ireland. He was also shuttled to the southern hemisphere where he was based at The Oaks Stud in New Zealand and later relocated there permanently. After a promising start he began to suffer from poor fertility and was retired from stud duty in 2015. The stud's manager Rick Williams commented "It is a pity as he’s been a very good stallion. He leaves a lovely type and when you look at his overall record you'd have to say he’s done a big job". His best winners included Shuka Dukedom and Spring Cheer.