On his return to Europe, Dubai Millennium contested the Prince of Wales's Stakes at Royal Ascot, in which he was ridden by Jerry Bailey, Dettori having been injured in a plane crash. In this race, he was finally matched against Sendawar, who by now had won four Group One races and was unbeaten for more than a year. Such was the reputation of the French colt that, for the only time in his career, Dubai Millennium was not the favourite, starting at odds of 5/4 behind Sendawar at 6/5. The challenge did not materialise, however, with Dubai Millennium leading from the start and finishing eight lengths clear of the German challenger Sumitas, with Sendawar, who had attempted to track the winner throughout the race, fading into fourth. When Bailey was asked to compare Dubai Millennium with the American champion Cigar, he described him as "equally impressive."