Stefanos Tsitsipas beat Spain's Roberto Bautista Agut in four sets to continue his superb run in Melbourne and reach the Australian Open semi-finals.
At 20 years and 168 days, Tsitsipas is the youngest man to reach the last four of a Grand Slam since Novak Djokovic at the 2007 US Open.
The Greek 14th seed won 7-5 4-6 6-4 7-6 (7-2) in three hours and 15 minutes.
He will face Spanish 2009 champion Rafael Nadal or unseeded American Frances Tiafoe next.
"It all feels like a fairytale almost. I'm just living the dream, living what I've been working for," he said.
"I feel a bit emotional but not too much because I know I really worked hard to get here."
Tsitsipas became the first Greek player to go beyond the fourth round of a Grand Slam when he knocked out six-time champion Roger Federer to reach the quarter-finals.
He is the youngest man to reach the last four in Melbourne since Andy Roddick in 2003.
Have your say
More Sports Headlines
- Boateng off to China as Levante announce transfer to Dalian Yifang
- Joshua Clottey’s return after three years motivated by regaining title
- 2019 Standard Chartered Trophy launched
- Khedira out of Juve game with Atletico due to irregular heartbeat
- Mukarama receives U-17 World Cup Golden Boot and Bronze Ball
- Barcelona fail to take chances against battling Lyon
- Liverpool frustrated by Bayern in Anfield stalemate
- GFA Elections: NC denies Master Degree requirement reports
- Supercopa de Espana: New four-team tournament set to be played abroad
- Hearts boss Kim Grant unhappy with lack of competitive football
- Kotoko coach reiterates CAF Confed knockout stage target
- Solskjaer praises Pogba as one of 'best attacking midfielders in the world'
- Sarri feels the heat as Chelsea fans turn on Italian coach
- Man Utd knock holders Chelsea out of FA Cup
- Saudi prince denies interest in £3.8bn Man Utd takeover