Elena Rybakina recovered from a shaky start to overwhelm Australian Ajla Tomljanovic 4-6 6-2 6-3 and set up a Wimbledon semi-final with Simona Halep, becoming the first Kazakhstan player to reach the last four of a Grand Slam.
Rybakina, the 17th seed, struggled in the first set but then started finding her serving range, at one point taking seven games in a row to secure the second set and put her in control of the third.
The 23-year-old, who would not have been allowed to play at this year's Wimbledon had she not switched allegiance from Russia four years ago, finished the match with an ace - her 15th of the match.
She will face 2019 champion Halep, the Romanian producing another eye-catching performance to surge into the semi-finals with a 6-2 6-4 win over American Amanda Anisimova on Wednesday.
Halep toppled a shellshocked Anisimova in 63 minutes to reach her third semi-final at the All England Club.
After Halep had wrapped up the first set when Anisimova banged a service return long, the American was left rejecting one racket after another into her red bag as she was broken for the fourth time to trail 4-1 in the second set.
The 30-year-old Halep was broken while serving for the match at 5-1 and Anisimova had her 0-40 down when she tried again at 5-3.
But a few hard-hitting slaps to her thigh at 15-40 down got Halep's legs moving again and the 16th seed secured victory when Anisimova swiped a backhand long.
"It's amazing and I'm really happy that I got through after a really tough match," said Rybakina of her historic victory.
Explaining a final set wobble after serving for it at 5-1, she added: "Maybe I was nervous. She played really well, was defending really well. I just tried to focus on myself to find my way and then I found it."
Rybakina struggled to reproduce the serving power and accuracy that had been a hallmark of her march into the last eight, failing to land almost half her first serves in the opening set.
She broke early in the second and though Tomljanovic's athletic court coverage enabled her to hit straight back, the tall Kazakh then took total command, breaking to love before winning the set on the back of 11 straight points.
She cranked up the pressure in the decider, taking a 3-0 lead after winning seven games in a row, and breaking again for 5-1.
Tomljanovic was left throwing her arms up in despair as nothing she tried seem to come off and she sensed her hopes of a first Grand Slam semi-final were slipping away for the second year in a row.
Serving for the match and the biggest win of her career, Rybakina slumped to 0-40, and though she fought back to deuce, Tomljanovic completed to break to cling on to her outside hope.
The Kazakh then wasted two match points on Tomljanovic's serve but it was the briefest of respites as Rybakina hammered down three service winners to close out her victory in style.
Earlier, after Halep had wrapped up the first set when Anisimova (above) banged a service return long, the American was left rejecting one racket after another into her red bag as she was broken for the fourth time to trail 4-1 in the second set.
The 30-year-old Halep was broken while serving for the match at 5-1 and Anisimova had her 0-40 down when she tried again at 5-3.
But a few hard-hitting slaps to her thigh at 15-40 down got Halep's legs moving again and the 16th seed secured victory when Anisimova swiped a backhand long.
