Keys won 6-4 7-5 on Rod Laver Arena to reach the fourth round of a grand slam for the first time in her career and set up a last-16 clash with fellow American Madison Brengle, who had earlier beaten compatriot Coco Vandeweghe in straight sets.
“My hands are still shaking,” Keys said in an on-court interview. “I’m really happy that I served that (last) game out. Right now I can’t even process anything. I am just so excited and excited to play Maddy in the next round.”
World number 35 Keys, who will celebrate her 20th birthday next month, is coached by three-time grand slam winner Lindsay Davenport and Davenport’s husband Jon Leach.
“Lindsay and Jon have been amazing,” she added. “It’s been a great off-season, I learned a lot and I’m just really happy they are here supporting me.”