Madison Keys upsets 2-time defending champion Aryna Sabalenka in 3 sets in the Australian Open final for 1st major title ...

The 18-year-old said he met Federer for the first time last year, while he has practiced with Wawrinka as the pair share the same management team.

A decade after first reaching the semifinals as a teenager, Keys stunned the world No. 1 to win her first Grand Slam title in Melbourne.