But he has never reached a Grand Slam quarter-final, although the longer best-of-five format has worked twice in his favour now at Roland Garros.
"All credit to him, that was fantastic to come from two sets to one down three times".
"I think psychologically that is a big, big breakthrough for Zverev today".
"I've been down 2-1 every single time but I'm unbelievably happy to be into the quarter-finals".
Novak Djokovic matched Roger Federer's mark of reaching nine consecutive quarter-finals at Roland Garros by beating No. 30 seed Fernando Verdasco 6-3, 6-4, 6-2.
"Me and my brother (Mischa) are guys that spend three, four hours a day in the gym, lifting heavy weights, on the treadmill".
Unseeded Putintseva made it to the quarters at Roland Garros in 2016 and fought against the odds to down Strycova 6-4, 6-3 to ensure she'll feature in the competition's last eight again.
He had to save a match point in the 10th game of the decider before breaking and holding to make the last 16 for the first time where he will face either French 15th seed Lucas Pouille or Russia´s Karen Khachanov.
On his third set point, the erratic Zverev found the net again with a sloppy backhand.
The second-set tiebreaker was scrappy, Zverev clinching it with an ace out of Khachanov's reach to level the match.
Zverev has youth on his side, but he has been spending a long time on court and his body is showing it. Having never played a five-set match at Roland Garros until this year, Zverev has now won two back-to-back.
It did not seem to impede him, however.
If she wins that match, Keys could meet Stephens in the semifinals.
The third-seeded pairing of Andreja Klepac and Maria Jose Martinez Sanchez beat the Americans 6-4, 6-7 (4), 6-0 to advance to the quarter-finals.
Keys beat No. 31 Mihaela Buzarnescu of Romania 6-1, 6-4 while Stephens, the U.S. Open champion in 2017, blew past Anett Kontaveit of Estonia 6-2, 6-0 in just 52 minutes on Court Philippe Chatrier. But Dzumhur felt it was within his reach and also ran out to catch it.
Later on Lenglen, Australian Open champion Caroline Wozniacki - seeded second - had a tough-looking fourth-round match against Daria Kasatkina.
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