Serena Williams congratulated Madison Keys on her Australian Open triumph and also stated that it proved she's "one of the best" on the WTA Tour. In a thriller final at Melbourne Park, the 19th-seeded American upset world No.

Caroline Wozniacki won the Australian Open women's singles title in 2018 after beating Simona Halep in the final. Serena Williams won the Australian Open women's singles title in 2017 after beating Venus Williams in the final. Angelique Kerber won the Australian Open women's singles title in 2016 after beating Serena Williams in the final.

Madison Keys — using a mix of solid serves, power and defense — upset two-time defending champion and top seed Aryna Sabalenka 6-3, 2-6, 7-5 to win the Australian Open on Saturday, giving the 29-year-old American her first Grand Slam title in 46 tries.