Meanwhile, Jelena Ostapenko is back in the Roland-Garros third round for the first time since 2017 - the year she made history in Paris as the first unseeded woman in the Open Era to lift the Coupe Suzanne-Lenglen.
The Latvian, unseeded this year as well, upset No.2 seed Karolina Pliskova 6-4, 6-2 to record the fourth top-10 victory of her career at a Grand Slam.
Ostapenko, who recently hired new coach Thomas Hogstedt, was in unforgiving form against the Czech, breaking the Ace Queen's serve five times and firing 27 winners in 17 games.
Nerves crept into the 23-year-old's game as she was serving for the victory, as she double-faulted on her second match point, but that only delayed the inevitable as she punched her ticket to the last 32 on the 69-minute mark.
"In the beginning it was tough, she was serving very well. I just knew before the match that I have to serve well as well and just be aggressive when I can and not miss many balls. Obviously she's No.2, she's a great player, so I knew it was going to be tough. I needed to bring one of the best tennis I can play to beat her," Ostapenko told Fabrice Santoro on court.
The world No.43 could face 2018 Roland-Garros finalist Sloane Stephens, who takes on Spaniard Paula Badosa later on Thursday.