Su Mac Lad was owned by I. W. Berkemeyer of New Milford, New Jersey, who purchased the gelding in 1959, and was trained and driven by Stanley Dancer.
[1] Su Mac Lad had a distinct lack of classical horseracing pedigree, having been born on a nondescript farm owned by Mrs. Paul Davis, a breeder in Henderson, Illinois.
Six-year-old Tie Silk, driven by Keith Waples, won in a time of 2:34.2, with favorite and returning winner Su Mac Lad in second and world record holder Porterhouse in third.
Driven by Stanley Dancer, Su Mac Lad paid bettors $2.90 to win in tying a world record at the 1¼-mile distance with a time of 2:32.6.
[6] Su Mac Lad died at age 28 on September 19, 1982, at Stanley Dancer's farm where he resided following his retirement from professional racing.