At Royal Ascot on June 18, Omaha contested the two and a half mile Ascot Gold Cup. He started favorite at odds of 11/8 against eight opponents, with his biggest danger appearing to be Quashed, a non-Thoroughbred filly who had won The Oaks in 1935. Before the race, which attracted a crowd estimated at 150,000, Omaha appeared agitated and almost unseated Beasley on several occasions. He was restrained by Beasley in the early stages before moving up to challenge Quashed for the lead just before the right-hand turn into the straight. The filly and the colt raced together throughout the closing stages, drawing well clear of the remaining runners. A furlong from the finish, Omaha drew level and looked the likely winner, but Quashed rallied in the final strides and was awarded the victory by a short head. Many years later, the 1936 Gold Cup was described by "The Observer" as the greatest race of all time. In his only subsequent race in England, Omaha ran second by a neck to Taj Akbar in the one and a half mile Princess of Wales's Stakes at Newmarket Racecourse in July. In this race, Omaha carried 138 pounds, eighteen pounds more than the winner, a three-year-old who had finished second to Mahmoud in The Derby.