Roger Federer? What is he, 40? No, he turned 37 in August 2018, but in professional tennis years, that's like 60. He won his first Grand Slam (that's a major in tennis) in 2003 at Wimbledon — before Facebook even existed. Federer has 20 career Grand Slam wins and an additional 10 more finals appearances where he didn't seal the deal. Somehow, despite his "advanced age," Federer keeps winning. In 2018, Federer reeled off 17 straight wins and won another Grand Slam, the Australian Open. The next time Federer wins a Grand Slam, he'll break the record held by Ken Rosewall as the oldest Grand Slam winner. (Rosewall won the 1972 Australian Open at 37.)

There's a lot of debate as to the all-time greatness of Roger Federer. He came into professional tennis at the end of the Andre Agassi era and seemingly only had Rafael Nadal as a rival — as opposed to the 1980s players with John McEnroe, Jimmy Connors, Bjorn Borg, and Ivan Lendl — but what's often forgotten is how good Nadal actually is. You can easily make the case that Federer is the best of all time, and Nadal is second, which makes what Federer is doing all the more incredible.

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