Top seed and defending champion Roger Federer needed just over an hour and a half to book a fourth-round spot by beating big-serving German Jan-Lennard Struff 6-3 7-5 6-2. This is Gulbis' best performance at Wimbledon in 11 attempts and his win yesterday put him joint-second on the list of players with the most attempts before reaching the round of 16.
Gulbis has had an incredible tournament, with all three of his matches so far going to five sets after he qualified into the main draw.
The 21-year-old from Germany is ranked at No 3 in the world but has not yet won a Grand Slam.
"I saw that he was getting exhausted in the fifth set", said the Latvian, smiling.
"Today in the warmup I was actually maybe thinking about it, not to play at all". I played well on clay, so it's coming together slowly. "I think he's going to be able to do it".
The warning came with Ostapenko two breaks of serve down at 2-5 and on the verge of losing her first set at these championships. Another break and the match would surely have been his but at 1-1 in the fourth set Gulbis dug in, saved a break point and never looked back.
"I worked really, really hard (to get back playing) and it's been a long, arduous road but I always expected to come out and do the best I can do". I thought that honestly.
The 27-year-old will face unseeded American Mackenzie McDonald in the fourth round on Monday. "I realised that he was getting exhausted, yes, so".
The mercurial Frenchman beat last year's semi-finalist 5-7 6-4 6-4 6-2 on Centre Court. "Obviously she's so aggressive, so if I would keep letting her play, I would lose anyway", she said of her approach that saw her finish with 29 winners against 22 unforced errors.
Russian qualifier Evgeniya Rodina outplayed an erratic Madison Keys in a 7-5 5-7 6-4 victory to reach the fourth round of a Grand Slam for the first time in her career.
Meanwhile, South African eighth seed Kevin Anderson progressed with a 6-3, 7-5, 7-5 win over Germany's Philipp Kohlschreiber.
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