"To be honest I was over the limit today. At the end I gave everything that I had out there, it was an amazing match," the 27-year-old added.
Mikel Oyarzabal's penalty after a slightly harsh handball decision opened the scoring in the 29th minute and Real Sociedad had the game completely under control before goals from Mikel Merino and Portu in the 78th and 81st minutes assured the three points.
"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."
Saturday ended with Newcastle United winning 3-1 at home over Burnley thanks to an excellent display from winger Allan Saint-Maximin and two goals from Callum Wilson. Enditem
Elche will look to build on its win in the Ipurua Stadium in a duel between recently promoted teams when it entertains a solid looking Huesca.
Matthaeus encouraged Schalke not to give up as 31 rounds of matches still remain.
Saturday also sees Valencia, who is second after a 1-0 win away to Real Sociedad, entertains Real Betis, who has lost consecutive matches after its winning start to the campaign. Betis coach Manuel Pellegrini needs an improvement after the poor first half display that saw his side thrashed 3-0 at Getafe on Wednesday.
Osasuna didn't play in midweek as its scheduled match against Granada was postponed to allow Granada to play in the Europa League, and the side from Pamplona should be fresher than Celta Vigo, who travels to the remodeled El Sadar Stadium after losing 3-0 at home to Barcelona.
"It's always exciting to play a qualifying round," said Suarez, who joined Atletico Madrid from their La Liga rivals Barcelona last month.
Aston Villa's Ollie Watkins (2nd R) celebrates after scoring his hat-trick goal during the English Premier League match between Aston Villa and Liverpool at Villa Park in Birmingham, Britain, on Oct. 4, 2020. (Xinhua)
Han Ziqi contributed a game-high 23 points, but her solo effort could not save Tianjin from a big loss.