Stefanos Tsitsipas defeat Spain's Roberto Bautista Agut in four sets to keep his superb run in Melbourne and reach the Australian Open Grand Slam last four.
Any suggestion of a 'Federer hangover' was squashed by Tsitsipas, who confirmed just why he is viewed as one of the hottest youthful prospects in tennis.
At 20 years and 168 days, Tsitsipas may be the youngest man to reach the last 4 of a Grand Slam since Djokovic at the 2007 US Open tournament.
Tsitsipas has become the first Greek participant to go beyond the fourth round of a Grand Slam when he sent home six-time champion Roger Federer to reach the quarter-finals.
The 20-year-old was too casual and his focus levels dipped before a second time violation when serving seemed to refocus him.
He is the youngest man to attain the semifinals in Melbourne since Roddick in 2003.
But the Greek taken care of immediately break twice from 4-2 down, hitting 18 winners and picking right up 90% of the points on his first serve in the first first half of the set.
Nevertheless, the Greek won the ultimate five points and when Bautista Agut netted a forehand, Tsitsipas fell to the pitch in shock.
Bautista Agut's combat nature, which commanded the meet to a fourth set tie-break, was regular of his attitude throughout the event.
The Spaniard beat Britain's Andy Murray in the 1st game before knocking out 10th seed Khachanov and 2018 finalist Cilic on his way to the last eight.
Three of his four wins had can be found in five sets and even though there have been no clear shows of tiredness, it had been bound to catch up with him eventually.
But after leading 4-2 in each one of the first three models against Tsitsipas, he will feel it was a missed chance to advance to a first Grand Slam semi-final.