Former world number one Caroline Wozniacki became the latest big name to crash out of Wimbledon as she fell to Barbora Zahlavova Strycova.
Czech player Zahlavova Strycova, ranked 43rd, took her sixth match point to secure a 6-2 7-5 win on Court 12 and earn a place in the quarter-finals.
Having beaten second seed Li Na in the previous round, Zahlavova Strycova started well and claimed the first set in 35 minutes.
Wozniacki, who spent 67 weeks as the world's top-ranked player but has slipped to 16th, then found herself 3-1 down in the second set before breaking back.
Zahlavova Strycova failed to convert two match points against Wozniacki's serve in the 10th game, as her 23-year-old Danish opponent eventually held to level at 5-5.
More match points followed in the 12th game, though, and eventually Zahlavova Strycova seized the moment.
Following a double-fault, Wozniacki sent a floated backhand just wide from close to the net as Zahlavova Strycova secured another outstanding victory.
Wozniacki admitted it was "one of those matches", but felt her opponent was perhaps pushing the time limits between points.
"I thought she was very slow, but I guess the referee, she has the time on it and if she is within the time, I guess it's okay," Wozniacki said.
"It is up to the referee or up to the umpire to say if she is or not."
Wozniacki, though, was not looking for excuses.
"She is a little bit of a different player to play, and so there was no rhythm out there. I didn't serve as well as I have earlier on in the tournament and that kind of makes it harder on grass," Wozniacki added.
"Even when I had some opportunities I made some stupid mistakes or didn't play the balls properly. You know, it was kind of, I guess, one of those matches.
"Of course I am a little disappointed sitting here. Obviously I would have loved to have been further. The fourth round has been the furthest I have gotten here, where I feel like I should have gone further some years, but, you know, I guess sometimes that happens. You just have to get yourself back up and keep working and come back next time.
"I will take a lot with me. I had a good week in Eastbourne and played some really good tennis.
"I played really well in the first week here, today unfortunately it wasn't as good, but I can take a lot with me and bring to the hard court season."
"I am definitely motivated and excited for the rest of the year, there is still a lot to be played and a lot of things can happen."