Until the detection of a blood infection, Summing performed so poorly that he was dropped from graded stakes races and entered in an allowance race.
Trained by Luis Barrera, brother of American Hall of Fame thoroughbred racehorse trainer Laz Barrera, Summing is best known for his upset over U.S. Champion 3-Yr-Old Colt Pleasant Colony in the Belmont Stakes with George Martens aboard.