Six years after surviving a battle with cancer and losing his leg, Sundquist began ski racing. At age 17 he moved to Colorado to pursue the sport full-time. Sundquist trained and competed for six years, and in 2006 he was named to the United States Paralympic Ski Team and raced in the IX Paralympic Games, which were held in Turin, Italy that March. Sundquist competed in two alpine skiing events for men – slalom and giant slalom. He did not win any medals.