Svitolina was a quarter-finalist at Melbourne Park past year and has set her sights high after her breakthrough in winning the WTA Finals Singapore, targeting a Grand Slam win and world number one. She has been driven throughout the tournament and the last win that she picked against World No. 1, Simona Halep.
Fourth seed Naomi Osaka, meanwhile, was composed as she beat crafty Latvian Anastasija Sevastova, emerging from an error-strewn first to win 4-6, 6-3, 6-4.
'[I'm] very impressed, ' she told a small group of reporters at Melbourne Park.
"Of course I believe she will win", he said. The US athlete, who has topped the worldwide rating of tennis players numerous times during her career, swiftly turned around and disappeared under the stands, letting Halep greet the crowd in the stadium first.
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Milan are hopeful of signing Genoa striker Krzysztof Piatek , enabling Higuain's move to Chelsea . We had a poor training session today due to all these rumours.
"That's why she's No.1", Williams said.
'I think she's fitter than she was last year, because even though she made really a lot of efforts to come back in shape last year, I don't think she had enough time, ' he admitted.
"I'm still learning which is, at my age and my point in my career, I think admirable and exciting that I still have things I can learn from".
"I've got to return a little bit better (against her) but I'll be ready. Game by game, I felt that my level is growing, and I had more confidence to go through it".
Naomi Osaka advances to her first Australian Open quarterfinal
I just told myself I'm going to die or win so it was just a mental game. "And I'm normal too", she said. Japan's Naomi Osaka reacts during her match against Latvia's Anastasija Sevastova .
'But I feel now she's back to being Serena on both the physical and emotional side'.
Having dropped a miserly nine games on her path to the fourth round, Williams raced through the opening set and looked primed to make short work of her Romanian opponent.
"I have the courage to say that, because I took the risk to stay home so much, and I haven't been prepared for the highest level in tennis, but I did not play bad, I'm happy about the way that it's been going this tournament, and I take only the positives".
Mouratoglou's suggestion that Williams was not "emotionally" ready was perhaps a contributing factor to the American's infamous US Open final meltdown. The two have met in US Open semi final before in which Pliskova defeated Serena by straight sets.
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Since then, he's represented Schalke , Milan (again), Las Palmas , Frankfurt and Sassuolo , who he joined last summer. Barca now sit five points clear at the top of the Liga table and 10 points ahead of third-placed Real Madrid.
'It's about finding a balance.' she said.