LONDON (Reuters) - Highlights of the seventh day at Wimbledon, the third Grand Slam tournament of the year, on Monday (times GMT):
Argentina’s Guido Pella came back from two sets down to beat former finalist Milos Raonic 3-6 4-6 6-3 7-6(3) 8-6 in a marathon encounter which lasted three hours and 41 minutes.
Japan’s Kei Nishikori committed 31 unforced errors against Mikhail Kukushkin but did enough to beat the Kazakh 6-3 3-6 6-3 6-4.
In his 12th Grand Slam quarter-final appearance, Nishikori will face second seed Roger Federer.
Second seed Roger Federer eased into the quarter-finals with a 6-1 6-2 6-2 win over Italian Matteo Berrettini.
Federer, chasing his ninth title at the All England Club, committed just five unforced errors in the match.
Defending champion Novak Djokovic fired 25 winners and did not face a single break point in a routine 6-3 6-2 6-3 win over French youngster Ugo Humbert.
In his 11th Wimbledon quarter-final appearance, Serbian top seed Djokovic will meet Belgian David Goffin.
Johanna Konta, the last Briton standing in the singles, rallied from a set down to beat sixth-seeded Czech Petra Kvitova, twice Wimbledon champion, 4-6 6-2 6-4 and reach the quarter-finals for the second time.
Konta, the number 19 seed, will play Kvitova’s compatriot Barbora Strycova for a place in the semi-finals.
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Sam Querrey outlasted compatriot Tennys Sandgren 6-4 6-7(7) 7-6(3) 7-6(5) in their last-16 encounter to set up a quarter-final meeting with third seed Rafa Nadal.
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Czech Karolina Muchova stunned world number three Karolina Pliskova 4-6 7-5 13-11 in a marathon encounter, which lasted three hours and 17 minutes.
Pliskova’s exit means Ash Barty will hold on to her world number one ranking at the end of the tournament.
In her first Grand Slam quarter-final, Muchova will meet eighth seed Elina Svitolina.
Belgian David Goffin reached his third Grand Slam quarter-final, beating Spain’s Fernando Verdasco 7-6(9) 2-6 6-3 6-4.
Seventh seed Simona Halep ended 15-year-old Cori Gauff’s dream run by beating the American 6-3 6-3 in the last 16.
The Romanian broke serve five times in the match to set up a quarter-final clash against China’s Zhang Shuai.
Spain’s Roberto Bautista Agut improves his head-to-head record to 7-0 against Benoit Paire, beating the Frenchman 6-3 7-5 6-2.
French Open champion Rafa Nadal eased past Portuguese Joao Sousa 6-2 6-2 6-2 to reach his seventh Wimbledon quarter-final.
The third-seeded Spaniard will next face American Sam Querrey.
Serena Williams produced a clinical display to beat Spain’s Carla Suarez Navarro 6-2 6-2 in 63 minutes on Court One.
The seven-time champion struck 21 winners and won 78% of her first serve-points to set up a quarter-final clash with fellow American Alison Riske.
Barbora Strycova fought back from a set and 5-2 down to beat Belgian Elise Mertens 4-6 7-5 6-2.
Strycova, who last reached the Wimbledon quarter-finals in 2014, will next face either Britain’s Johanna Konta or her Czech compatriot Petra Kvitova.
China’s Zhang Shuai recovered from a mid-match blip to beat Ukrainian 19-year-old Dayana Yastremska 6-4 1-6 6-2.
Zhang, ranked 50th in the world, equalled her best ever Grand Slam singles performance - a quarter-final appearance at the 2016 Australian Open.
Eighth seed Elina Svitolina struck 30 winners in a routine 6-4 6-2 win over Croatia’s Petra Martic to reach her first Wimbledon quarter-finals.
American Alison Riske came back from a set down to beat world number one Ash Barty 3-6 6-2 6-3 in the last 16.
Riske, ranked 55th in the world, claimed a decisive break in the eighth game of the final set to knock out Australian Barty and reach her first Grand Slam quarter-finals.
“I’m so excited, and so proud of myself for the way I’ve handled matches here,” Riske said after the match.
“I couldn’t begin to say what Wimbledon means to me. Getting to the quarter-finals is amazing, but just the way I’ve been fighting is the best thing for me.”
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Roger Federer, Rafael Nadal, Novak Djokovic and Serena Williams are all round of 16 action at the All England Club later on Monday.
Reporting by Hardik Vyas and Arjun Panchadar in Bengaluru, Editing by Ed Osmond