Teenoso third favourite for the Lingfield Derby Trial in May. He took the lead five furlongs from the finish and stayed on well to win by three lengths from Shearwalk. When Lester Piggott, who had won the race eight times previously, elected to ride Teenoso in the Derby, the colt was strongly supported in the betting and started 9/2 favourite in a field of twenty-one runners. Racing on the heaviest ground seen at Epsom for many years, Teenoso was among the leaders from the start. Piggott sent the colt into the lead early in the straight and he was never in
Roberto (horse) Day, he was replaced by Lester Piggott. Roberto started the 3/1 favourite for the Derby in a field of twenty-two runners. He was sent to the front by Piggott inside the two furlong pole but was strongly challenged all the way to the finishing line by the outsider Rheingold. In a closely contested finish, Roberto won by a short head. This victory, which was only confirmed after a stewards' enquiry, was poorly received by the crowd, many of whom felt that Williamson had been unfairly deprived of the ride. The victory made John Galbreath the first person to own winners