"Everyone on the team has to contribute in some way," she noted.
It was also the 96th victory at Roland Garros for the Spaniard, who is seeking a 20th Grand Slam title to equal Roger Federer's record.
"I got a bit emotional last two points of my match. I really started to think still about the match because in tennis we really never know when it's the end. But my memories, happy memories, when I made my comeback here in 2017, when I step on the Philippe Chatrier, I couldn't really imagine me to be in the quarterfinal of this slam. Everything just came back to me," said Kvitova, who was attacked by a break-in knife-wielding robber at her home in the Czech Republic during the off-season of 2016, leaving her dominant left hand seriously injured. It was at Roland Garros that the two-time Grand Slam champion made her comeback.
Jiangsu took to attacking the basket from the paint early on, before going up 20-9 on a 14-0 surge. Jiangsu went on another 16-3 run to start the second quarter to extend its advantage to almost 30 points, and Shaanxi came no closer than 14 points during the entire second half.
Also on Sunday Feyenoord was far too strong for Willem II in Tilburg. The home team went in front through Vangelis Pavlidis, but Ridgeciano Haps, Bryan Linssen and a brace by captain Steven Berghuis earned Feyenoord a convincing 4-1 win. AZ drew 4-4 at Sparta after surrendering a 4-0 lead in Rotterdam.
Jose Bordalas' men now travel to play Real Sociedad - one of the most attractive sides in La Liga, but who have struggled for form at home since the return of football in June.
Alvaro Ordiozola will continue at right back after Dani Carvajal suffered a knee injury on Friday that will sideline him for a couple of months, while Ferland Mendy will likely return on the left after being rested in the narrow midweek win at home to Valladolid.
Next up for Halep is another 19-year-old youngster, Iga Swiatek of Poland, whom Halep defeated in the round of 16 here last year.
Sichuan was held to six of 26 on three-pointers and out-rebounded its opponents 44-30.
"I don't know what happened actually, I felt like I was playing perfectly, I was so focused the whole match, even I am surprised that I can do that," said the 54th-ranked Swiatek, who fired 30 winners and won 81 percent of her first-serve to wrap up the victory.
"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.