Australian Open fans have been left bemused by Serena Williams' mother Oracene Price, who was caught sitting stern-faced and emotionless while her team erupted in celebration following Serena's hard-fought win over Simona Halep.
Serena is also looking to match Margaret Court's record of 24 Grand Slam titles and would hope for one at the Melbourne Park.
In a towering performance, the American great scored her biggest win since giving birth to break down the Romanian top seed 6-1, 4-6, 6-4 and move into a quarter-final against seventh seed Karolina Pliskova.
Speaking on court, Williams said: "It was a really intense match, some incredible points".
"It is great to be back out and playing again on this court". She's the No1 player in the world, and there's a reason why. I don't know, it's definitely something that's innate.
"I have the courage to say that, because I took the risk to stay home so much (for off-season rest)".
Halep opened with a break of serve, but that was as good as things got for the top seed in the first set as Williams came storming back by winning the next six games in a row to take it in just 20 minutes.
Highlights from day five at the Australian Open
Maria Sharapova and Caroline Wozniacki's icy relationship was on full display in their third-round match at the Australian Open . It was a dominant performance by Maria Sharapova as she won 5 return games while winning all of her own service games.
But she flirted with defeat on the eighth evening of the tournament, saving three break points in the third just as Halep seemed to be taking charge.
Williams' showed her tenacity and will power as she managed to keep the Romanian at bay despite her ruthless attacking onslaught. "I have to if I want to stay in the tournament", she said.
"You want to go far and as a seed I feel I should go far".
Both players reached the quarterfinals here a year ago, but Keys had more success at the majors in 2018, when she progressed to the semifinals at the French and US Opens. She broke Halep's serve in the very next game to then win the match on her serve.
"I'm like, 'Olympia, there's a plethora of movies to choose from,"' Williams said.
The fourth-seeded Osaka grew in confidence from the narrow escape and lifted her tempo and shot-making consistency, grabbing the crucial service break in the sixth game. It's 10 months, so I can't be too upset at myself.
"First of all, I always think she can win, and she will win". The match was evenly poised in the third set.