No. 19 seed American Madison Keys moved into the Australian Open quarterfinals for the fourth time in her career by ousting No. 6 seed Elena Rybakina of Kazakhstan on Monday. Keys shook off a second-set lull to topple 2023 Australian Open finalist Rybakina 6-3, 1-6, 6-3 in 1 hour and 49 minutes. The American is now a win away from reaching her third semifinal at Melbourne Park, having made the final four in 2015 and 2022. Keys, who won the WTA 500 title in Adelaide a week ago, is now on a nine-match winning streak, and she is the tour leader in match wins so far this year with an overall win-loss record of 10-1 in 2025, according to WTA stats.