Gaston is to challenge third seed Dominic Thiem in the fourth round. Earlier in the day, the Austrian had claimed another straight-sets victory over 28th seed Casper Ruud, beating the Norwegian 6-4, 6-3, 6-1.
The Spaniard, who is seeking his 13th title at Roland Garros, defeated Sinner 7-6 (7-4), 6-4, 6-1 to set up a rematch with Diego Schwartzman on Friday.
"It's been long ride definitely. Everything came to my mind when I had my whole family, people who I loved to help me through the tough, tough time," said Kvitova. "I was just playing in the Philippe Chatrier, it was such nice to win the match and to be in the quarterfinal."
The visitors from Poprad did not put on an offensive show either, but scored twice, which was sufficient for earning their first victory of the season.
Real Sociedad had a comfortable 3-0 win at home over Getafe thanks to Mikel Oyarzabal's first half penalty and goals from Mikel Merino and Portu in the 78th and 81st minutes.
Shaanxi trailed for most of the game, but outscored Wuhan 23-18 in the last quarter to grab the morale-boosting win.
"We aimed at testing the team, as the two sides have a big gap. Our players executed our tactics in transition, but we made too many mistakes," rued Hebei coach Ma Tao.
Dilana Dilishati finished with a game-high 21 points. Zhang Dongxia registered a double-double of 10 points and 12 rebounds.
The 33-year-old had scored 45 goals in 68 games and won two A-league championships since he joined the Sky Blues in August 2018.
Shaanxi's Chen Yanyu was an assist shy of a triple-double with 21 points, 12 rebounds and nine assists. Li weighed in with 19 points.
On September 6, when Wuhan fans finally got the chance to attend Zall's match against title contenders Beijing Guoan in Suzhou, near Shanghai, hundreds of them made a 750-kilometer (450-mile) trip eastwards to Suzhou for the game.