How about Roger Federer with his 20th career Grand Slam?
Interesting tidbit: in the summer of 2014 I bought a Canadian sports magazine (SportsNet, now defunct) and there was a story in it about Federer being in the twilight of his career. He's now won three Slams in the last year.
Know what the cover story of that magazine was? Johnny Manziel, and how the then-rookie might turn things around in Cleveland.