In 1996, Doriemus won the Queen Elizabeth Stakes, in the autumn, and the Turnbull Stakes, in the spring, but was fourth and sixth, respectively, in the Cups. In 1997, he bled in Octagonal's Australian Cup, but returned to run second to Might and Power in both Cups. Doriemus's jockey, Greg Hall, believed he had won the Melbourne Cup, and gave a wave of his whip after crossing the line, but the photo showed Might and Power had prevailed by the barest of margins. In the autumn, Doriemus was again placed behind Might and Power in the Mercedes Classic, and was runner-up to Tie the Knot in the Sydney Cup. In his final campaign, in the spring of 1998, he was second in the Metropolitan but finished 19th in the Melbourne Cup.