Xander Schauffele has all the evidence he needs to believe he can reach the career Grand Slam. He picked up two majors last year in the PGA Championship and the British Open.

Conversely, as one who has never dealt with a prolonged sabbatical, he noted that he took being healthy for granted. This revelation stuck, as years of uninterrupted play had obscured the fragility of athletic prime—a lesson many competitors only learn after it's too late.