Ekaterina Makarova, Maria Sharapova and Simona Halep coasted into the Australian Open quarter-finals, while Eugenie Bouchard battled.
Ekaterina Makarova is into the Australian Open quarter-finals for the third time in four years, after downing Julia Goerges on Sunday.
Makarova, seeded 10th, has not dropped a set all tournament and wrapped up a 6-3 6-2 victory over unseeded Goerges on Margaret Court Arena.
The left-hander was simply more clinical in the first set against Goerges, converting all three of her break-point chances - while Goerges could only win one of three.
Makarova committed only 14 unforced errors - her fewest tally in her four matches at Melbourne Park - while Goerges made 21 errors under little pressure for the contest.
The Russian will now face third seed Simona Halep on Rod Laver Arena.
Halep beat Yanina Wickmayer for the first time in her career, triumphing 6-4 6-2.
As well as never beating Wickmayer prior to Sunday's match, Halep had never claimed a set against the 25-year-old, but that has now changed.
Second seed Sharapova and seventh seed Bouchard will meet in the quarter-finals, after contrasting centre-court victories.
Bouchard staved off a defiant Irina-Camelia Begu to advance to the quarter-finals.
Bouchard defeated Begu 6-1 5-7 6-2 on Rod Laver Arena, taking two hours six minutes despite winning nine of the first 10 games.
The cause of supporters group 'Genie Army', Bouchard simply had too many weapons early - noticeably her forehand which produced 23 winners - for Begu.
The Romanian put up a stunning rearguard from trailing a set and a double-break, reeling off five straight games in the second set and eventually squaring the match.
But Bouchard, who made the final four in her first Melbourne main-draw appearance last year, continued her love affair with the tournament, breaking twice in the third set to move into the last eight.
Sharapova, meanwhile, barely got out of first gear as she dismantled a wayward Peng Shuai 6-3 6-0.
Peng, a US Open semi-finalist in 2014, hit 29 unforced errors, as the 2008 champion earned victory in one hour 15 minutes.