Then something happened which marred the match.
Nara, a Japanese player and ranked No. 238, reached the main draw at Roland Garros via the qualifying tournament.
Commentators didn't hold back their fury and the unexplained absence of Azarenka.
"This is downright disrespectful for the audience".
"It's shocking that it's allowed".
"Can you imagine any other sport where you take a break of up to a quarter of an hour?"
Osaka appeared to ask the umpire a question during the unexpected break.
Osaka said it was the most nervous she had ever felt during a match, noting it being her first time playing a Slam as the world No. 1 and first match on Court Philippe Chatrier.
The win was a repeat of Osaka's first-round match against Slovakia's Anna Karolina Schmiedlova, where she had to overcome a terrible start to secure a 0-6, 7-6 (4), 6-1 win.
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Williams' coach Patrick Mouratoglou said: "Considering the small amount of time she had, I think she did an incredible job and I can see that she is able to compete at a good level so I am quite happy".
She lost the opening four games against Azarenka but this time it was less to do with her own mistakes and more to do with the fact Azarenka was playing tennis reminiscent of that which took her to two Australian Open titles and to world number one. Trailing 5-1, Osaka won the next three games but was unable to keep her momentum going as the Belarusian took advantage of her unforced errors to close the set.
She is aiming to win a third successive Major, having bagged her first two at the U.S. and Australian Opens. "It's a very special day for me as it's the first time in my life that I have played in front of my son", said the 32-year-old Serb after a 23rd straight win at the Slams.
Top-seeded Novak Djokovic carries a 24-match Grand Slam winning streak into his third-round match against Salvatore Caruso, a qualifier from Italy who is ranked 147th.
However, the 21-year-old held her nerve, despite squandering two match points, to secure her place in the third round and a clash against either Greek 29th seed Maria Sakkari or Katerina Siniakova of the Czech Republic.
However Halep did not have to wait long to break back and seal victory with an audacious drop shot at the net, winning the second 6-1. Monfils claimed the encounter 6-3, 6-4, 6-4 to set up a meeting with compatriot Antoine Hoang who dispatched the Spanish veteran Fernando Verdasco in four sets.
However, the fourth seed Dominic Thiem struggled against the wiles of Alexander Bublik.
Wang, the last Chinese player remaining in singles draw, fell 6-3, 6-0 to Polish youngster Iga Swiatek. For me it was tough.
Edmund called on the trainer while trailing 7-6 (7/3), 6-3, 2-1 and, after a short discussion, he informed the umpire that he was unable to continue.