|Breeder||Paul Mellon & James B. Moseley|
|Trainer||Thomas J. Kelly|
|Sport Page Handicap (1978)|
Topsider won eight races from eighteen career starts, including the Sport Page Handicap at Aqueduct Racetrack in New York City.  In another of his wins he set a new track record of 1:14 2/5 for 6½ furlongs at Saratoga Race Course.
When his racing career was over, Topsider was sent to Claiborne Farm in Kentucky where became a significant sire whose offspring won more than $18 million in racing.  Among his best were two Champions: North Sider, the 1987 American Champion Older Female Horse, and Salse, a Champion Three-Year-Old in France. Topsider stood his entire career at Claiborne Farm and died there on October 18, 1992 as a result of a hernia in his diaphragm.