Topsider (1974–1992) was an American Thoroughbred racehorse. He was a bay son of the great Northern Dancer and the very speedy racing mare Drumtop. [1] Topsider won eight races from eighteen career starts, including the Sport Page Handicap at Aqueduct Racetrack in New York City.[2] In another of his wins he set a new track record of 1:14 2/5 for 6½ furlongs at Saratoga Race Course.