Ten years after reaching her first major semifinal at the 2015 Australian Open, and eight seaons after making the 2017 US Open final, Madison Keys is a Grand Slam champion. The 29-year-old American completed a historic, dream run to the 2025 Australian Open crown with a 6-3, 2-6, 7-5 victory against two-time defending champion and world No. 1 Aryna Sabalenka on Saturday.