At this stage of the tournament, Serena is set to play against Tamara Zidanšek from Slovenia.
The 38-year-old's new outfit proved a major talking point for viewers but Williams made the biggest statement with a commanding display on centre court.
But the eighth seed was restrained in her celebrations and said: "It was a good match for me, she was a really good fighter, she did not just let me win".
The American star started her campaign in Melbourne in style, needing less than an hour to cruise past Russia's Anastasia Potapova 6-0, 6-3.
Williams admitted she had a fight on her hands.
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Tsitsipas then elaborated on the issue post-match, suggesting the football-like atmosphere didn't belong in tennis. "It is a condition".
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City's pressure should have yielded the opening goal in the 35th minute after Mahrez superbly prised open United's defence. Guardiola chose to protect Laporte by playing him in a five-man defence along with Fernandinho and Nicolas Otamendi .
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Looking at Serena Williams, the American superstar was dominant during the opening round.
"Straight-sets win" can sometimes be an unfair identifier for a match that was actually tightly contested, and that was certainly the case as Williams reached deep into her bag of tricks to progress past her 70th-ranked opponent on Rod Laver Arena. During the win, Serena Williams won 88% of her service games and 5 return games. Potapova improved in the second set and even broke for a 2-1 lead before Williams responded.
The Slovenian created four break chances and failed to convert any, battling against 14 opportunities offered to Serena and giving serve away four times to hit the exit door despite a solid effort in set number two where she could have opened a 4-2 gap.
Cloudy skies and the threat of rain greeted players and spectators on Day 1 at the Australian Open, the first Grand Slam tournament of the decade.
"It was fantastic", Williams said. I've been pretty close but it was special for me and for her.