Roger Federer

Tennis, Switzerland. Federer switched to a larger racket head in 2014 and, after knee surgery cost him most of 2016, came back with a flatter, more aggressive one-handed backhand taken early, a change worked on with coach Ivan Ljubičić. At 35 he won the 2017 Australian Open, beating Rafael Nadal in the final, and added Wimbledon that year and the 2018 Australian Open for a 20th major.