American teenager Coco Gauff did not let 10 double-faults, 12 break points or a warning from the chair umpire about receiving coaching from her father disrupt her progress into the second round at Roland Garros.
The 18-year-old Gauff began her trip to Paris with a 7-5, 6-0 victory over Canadian qualifier Rebecca Marino on Sunday. Gauff's best performance at any Grand Slam tournament came a year ago at the French Open, where she reached the quarterfinals before losing to eventual champion Barbora Krejcikova.
Sixth-seeded Ons Jabeur, however, was knocked out of the tournament by 56th-ranked Magda Linette of Poland 3-6, 7-6 (4), 7-5. Jabeur began the day with a tour-leading 17 wins on clay this season. She won the Madrid Open and made it to the final of the Italian Open this month.
Jabeur, a Tunisian who is the first Arab woman to win a WTA title and first to reach a Grand Slam quarterfinal, acknowledged: "I was expecting myself to go far in this tournament."
In Gauff's match, the chair umpire told her that her father was moving his hands throughout the match, which she could interpret as coaching.
"... I was just asking her, like, what signals that he's showing, because, like, for me, I don't see anything. But she told me she was telling me to be careful because some of his signals or whatever he was doing with his hands could be interpreted as coaching and I was just letting her know that I can't tell him not to do what he's doing with his hands because we have no coaching.
"But at the end of the day she was just doing her job and then I was just doing my job I guess as a player and defending my integrity and, yeah, so, yeah, for me it was just funny because I have had so many conversations with my dad that when there's coaching allowed I tell him, 'Don't say anything.' So that's kind of why I was laughing a little bit in that conversation."
Gauff had some serving issues against Marino but managed to set aside 10 of the 12 break points she faced. One key stat that helped Gauff was that she made only 16 unforced errors, while Marino accumulated 40.
Marino was appearing in the French Open for the first time since 2011.
Two-time Grand Slam champion Garbine Muguruza, meanwhile, exited the French Open in the first round for the second year in a row.
Muguruza won the title at Roland Garros in 2016 and was seeded 10th this year but was defeated 2-6, 6-3, 6-4 by Kaia Kanepi of Estonia on Sunday.
Kanepi turns 37 next month and is the oldest player in the women's draw in Paris. She is ranked 46th and is participating in her 15th French Open. Her best showings were quarterfinal appearances in 2008 and 2012; she has appeared in seven Grand Slam quarterfinals but never won one.
The match ended under a drizzle and Muguruza missed a service return on match point, then cracked her racket against the ground.
ESPN's D'Arcy Maine and The Associated Press contributed to this report.