Melbourne - Garbine Muguruza gained revenge for a tough loss last year and a place in the Australian Open last 16 with a comprehensive victory over Anastasija Sevastova on Friday.
The French Open champion was broken first up but she quickly recovered from the slow start to overwhelm the Latvian 6-4, 6-2 in 64 minutes on Margaret Court Arena.
The Spanish seventh seed was upset in round two of last year's US Open by 33rd-ranked Sevastova and she was delighted to get her own back in Melbourne.
"I came knowing that the last time we played in a Grand Slam she beat me, so I was super-motivated," Muguruza said.
"I wanted revenge, so I think that helped."
Muguruza, who has never gone beyond the Australian Open fourth round, next plays Romania's Sorana Cirstea, who beat Alison Riske of the United States.
Collated results from the Australian Open on Friday (x denotes seeding):
Andy Murray (GBR x1) bt Sam Querrey (USA x31) 6-4, 6-2, 6-4
Mischa Zverev (GER) bt Malek Jaziri (TUN) 6-1, 4-6, 6-3, 6-0
Stan Wawrinka (SUI x4) bt Viktor Troicki (SRB x29) 3-6, 6-2, 6-2, 7-6 (9/7)
Andreas Seppi (ITA) bt Steve Darcis (BEL) 4-6, 6-4, 7-6 (7/1), 7-6 (7/2)
Jo-Wilfried Tsonga (FRA x12) bt Jack Sock (USA x23) 7-6 (7/4), 7-5, 6-7 (8/10), 6-3
Dan Evans (GBR) bt Bernard Tomic (AUS x27) 7-5, 7-6 (7/2), 7-6 (7/3)
Roger Federer (SUI x17) bt Tomas Berdych (CZE x10) 6-2, 6-4, 6-4
Kei Nishikori (JPN x5) bt Lukas Lacko (SVK) 6-4, 6-4, 6-4
Angelique Kerber (GER x1) bt Kristyna Pliskova (CZE) 6-0, 6-4
Coco Vandeweghe (USA) bt Eugenie Bouchard (CAN) 6-4, 3-6, 7-5
Anastasia Pavlyuchenkova (RUS x24) bt Elina Svitolina (UKR x11) 7-5, 4-6, 6-3
Svetlana Kuznetsova (RUS x8) bt Jelena Jankovic (SRB) 6-4, 5-7, 9-7
Sorana Cirstea (ROM) bt Alison Riske (USA) 6-2, 7-6 (7/2)
Venus Williams (USA x13) bt Duan Yingying (CHN) 6-1, 6-0
Garbine Muguruza (ESP x7) bt Anastasija Sevastova (LAT x32) 6-4, 6-2
Mona Barthel (GER) bt Ashleigh Barty (AUS) 6-4, 3-6, 6-3