Miles Chamley-Watson doesn’t quite roll like other athletes in fencing, his relatively low-wattage Olympic sport. The American medal hopeful at the Paris Olympics, for example, returned home for a week in May from a competition in Shanghai—Team USA won gold in the team foil event—before jetting off to Monaco watch one of his best friends, fellow globe-trotting sportsman Lewis Hamilton, race in Formula One’s crown-jewel event, the Monaco Grand Prix.