A quick look at the Australian Open:
LOOKAHEAD TO MONDAY
Rafael Nadal will play Italian veteran Fabio Fognini for a place in the Australian Open quarterfinals on Day 8. Nadal has been bothered by back stiffness but has come through three rounds without dropping a set and is starting to feel OK. He’s aiming for a men’s record 21st major title. ATP Cup winners Daniil Medvedev and Andrey Rublev could set up an all-Russian quarterfinal if they advance through the fourth round. Fourth-seeded Medvedev will take a 17-match winning streak into his match against Mackenzie McDonald. Rublev is playing Casper Ruud in the subsequent match on Margaret Court Arena. Top-ranked Ash Barty will continue her quest for a drought-breaking win for Australian women at the national championship when she takes on American Shelby Rogers in a night match. The last Australian woman to win the title was Chris O'Neil in 1978. Two other American women are involved in the fourth-round matchups: No. 22 Jennifer Brady is playing No. 28 Donna Vekic and Jessica Pegula is against fifth-seeded Elina Svitolina. No. 18 Elise Mertens takes on Karolina Muchova in the other match.
Mostly sunny, high of 27 degrees Celsius (68 Fahrenheit)
Cloud clearing to a sunny afternoon, high of 20 Celsius (81 Fahrenheit).
SUNDAY'S KEY RESULTS
Women’s Fourth Round: No. 2 Simona Halep beat No. 15 Iga Swiatek 3-6, 6-1, 6-4; No. 3 Naomi Osaka beat No. 14 Garbiñe Muguruza 4-6, 6-4, 7-5; No. 10 Serena Williams beat No. 7 Aryna Sabalenka 6-4, 2-6, 6-4; Hsieh Su-Wei beat No. 19 Marketa Vondrousova 6-4, 6-2.
Men’s Fourth Round: No. 18 Grigor Dimitrov beat No. 3 Dominic Thiem 6-4, 6-4, 6-0; No. 6 Alexander Zverev beat No. 23 Dusan Lajovic 6-4, 7-6 (5), 6-3; Aslan Karatsev beat No. 20 Felix Auger-Aliassime 3-6, 1-6, 6-3, 6-3, 6-4.
STAT OF THE DAY
25 — years since a man reached the quarterfinals at a Grand Slam on debut. Karatsev's fourth-round win made him the first to achieve that since Alex Radulescu at Wimbledon in 1996.
QUOTE OF THE DAY
“I’ll be ready for anyone.” Karatsev, after beating a second seeded player in three days, on who he'd prefer to play in the Australian Open quarterfinals.