Williams herself has said she's not too bothered by the catsuit ban, because "obviously, the Grand Slams have a right to do what they want to do", she said at a press conference at the US Open on Saturday.
Stephens will face two-time Australian Open champion Victoria Azarenka in the next round after she defeated 25th seed Daria Gavrilova of Australia 6-1, 6-2.
Having opened up a double break lead, 36-year-old Serena was forced to save three break points in the seventh game before she wrapped up the opener on the Witthoeft serve. "Now they are both trying to play her best again, and could be interesting match to watch".
No. 16-seed Venus punched her ticket to the duel earlier in the day by fending off Camila Giorgi 6-4, 7-5 at Louis Armstrong Stadium.
"It's a tough match to have so early in the tournament".
And Venus is hoping she can be reunited with her sister for the first time in nearly two years.
Serena added, "I never root against her, no matter what".
Venus joked Wednesday in her on-court interview that it was "two against one ... so at least this time it will be fair". "We bring out the best when we play each other".
"If I would say my true feelings, it would be bleeped out, because it was ridiculous". I have some fun memories of winning Wuhan in 2015 so I'm excited that I'll get a chance to go back there. "I think first it was my dad and my mom and my family, going out there to help me and push me".
Estonia's Kaia Kanepi followed up her first round win over world number one Simona Halep by seeing off Jil Teichmann of Switzerland, 6-4, 6-3.