No, they haven’t. But two came very close. Lester Pearson enjoyed a prolific and competitive hockey career, particularly during his years studying at Oxford, playing for Switzerland in the European championships in 1922. The following year, he was approached to play for England’s hockey team in the 1924 Winter Olympic Games in Chamonix, France. He turned it down, having just accepted a job as a lecturer at the University of Toronto.
John Turner won the national 100-yard and 200-yard dashes in 1947, ultimately running the 100 in 9.7 seconds. Then, in February 1948, he injured his knee in a car accident. He trained hard to run in Canada’s Olympic trials that spring, but collapsed on the track, ending his chance to compete in the Summer Olympic Games in London.