Laura Robson produced a stunning fightback to beat Marina Erakovic and become the first British woman to reach the last 16 at Wimbledon since 1998.
The British number one was three points from a straight-sets defeat on Court Two, but recovered to win 1-6 7-5 6-3.
Robson, 19, will face Estonia's Kaia Kanepi or Alison Riske of the United States in Monday's fourth round, which will also see Andy Murray play Mikhail Youzhny.
It is the second time Robson has reached the last 16 at a Grand Slam, following her breakthrough at last year's US Open.
The former Wimbledon junior champion looked on course for a swift and disappointing defeat when she dropped the first set in just 22 minutes.
Erakovic, 25, was serving superbly and broke for a third time to move 3-2 up in the second set, but with victory in sight the New Zealander began to falter.
A double-fault by the world number 71 when serving for the match opened the door for Robson, who hammered a forehand winner to level at 5-5.
Two games later it was Robson pushing hard for the set and, after a Hawk-Eye challenge helped the Briton out, Erakovic double-faulted once again to see her lead disappear.
Robson was on a roll, winning eight straight games to move 4-0 clear in the decider, while the first-set form that saw Erakovic make just one unforced error seemed a lifetime ago.
There were nervous moments when Robson's run ended with a break, but the teenager played with real guts to cling on to her serve in the closing stages.
Roared on by the Court Two crowd, she battled her way to match point and fired a brilliant forehand down the line to clinch victory, before hugging her good friend Erakovic at the net.
"I was getting my butt kicked basically," Robson told BBC Sport.
"I was really struggling to return her serve. I just tried to work as hard as possible and stick with it until she started to get nervous, and that's what happened.
"The crowd were amazing. I'm so so happy to get through but definitely couldn't have done it without them."