Serena eased through her night match against Carina Witthoeft, winning 6-2 6-2 against the German, while Venus defeated Italy's Camila Giorgi 6-4 7-5 in the midday heat at Flushing Meadows.
Venus won their second round clash in Australia in 1998 but Serena, bidding for a record-equalling 24th Grand Slam title, has built up an advantage over the last two decades, enjoying a 17-12 head-to-head superiority. We would have liked to have played later but it is what it is.
White tells TMZ Sports she felt the whole thing was sexist - "It's kinda insane that women aren't allowed to wear what they want to work".
Venus was not interested in reminiscing about past battles with her sister when asked about their most memorable match, describing herself as "the kind of person that looks forward". "We make each other better".
'The best part is we bring out the best in each other.
Venus, 38, and playing her 80th Slam, notched up her 775th career win by seeing off Giorgi.
"You're beating it up now", the elder sister said.
The 28-year-old echoed the thoughts of former world number one Victoria Azarenka, who believes women and men are still judged by different standards and wants the WTA to be at the forefront of fighting such attitudes.
"I think the umpire was probably overwhelmed by the situation", said Cornet who insisted that French tennis federation (FFT) president Bernard Giudicelli's Roland Garros ban on Serena Williams's catsuit was much worse and genuinely worthy of being deemed "sexist".
"Everything's fine, guys", she said.
"I think when I was 5 years old, that's when I think I started liking it a lot", says Venus in the video, which is now going viral. I'm always living in a fantasy world.
But 20 years since the sisters' first collision course in the Australian Open, which Venus won 7-6 (7-4), 6-1, another chapter awaits Friday. The tennis star said the catsuit made her "feel like a warrior" and was made out of compression fabric that helped her body deal with life-threatening blood clots when she gave birth. "I've been wearing trousers in general a lot when I play, so I can keep the blood circulation going".