Can unassuming $251 bolter cash in at the Australian Open?
A $251 bolter pre-tournament, Korean wrecking ball Hyeon Chung is now one match away from the Australian Open final.
The bespectacled baseliner's giant-killing run shows no sign of slowing on the evidence of a comfortable 6-4 7-6 (7-5) 6-3 quarter-final triumph over unseeded American Tennys Sandgren.
The world No.58 will face either defending champion Roger Federer or Wimbledon finalist Tomas Berdych for a place in Sunday's final against either Marin Cilic or Kyle Edmund.
With wins at Melbourne Park so far over six-time champion Novak Djokovic, world No.4 Alexander Zverev and Sydney champion Daniil Medvedev, Chung is the hottest player in the draw.
Easily bettering his previous grand slam best - a third-round appearance at last year's French Open - the 21-year-old admitted running on adrenalin.
"I think I'm not tired because I win. When I win matches against top players, I never tired," he said.
"Just happy, no? Mentally happy, I'm not tired.
"I'm just trying to play like same all the time. Yeah, I'm just trying to fight 100 per cent."
Asked if he is surprised at a career-defining surge, he said: "Yeah, I'm really surprised because I really don't know.
"I make semis, I beat Sascha (Zverev), Novak, the other good players. I never playing in second week in grand slam, so I'm really surprised."
TAB said Chung had now firmed to $6.50 third favourite and will deliver a $200,000 windfall for a punter who outlaid $800 on the right-hander to land the first major of the season.
Chung is the first is the first Korean to reach a grand slam semi-final.
Ranked No.58 in the world, he is the lowest-ranked man to make the last four of the Open since Russian Marat Safin in 2004.
True to form, unflappable Chung is unaffected by his achievement - and his forthcoming opponent.
Asked if he had preference to play either 19-time major champion Federer or the polished Berdych, he said: "Whoever wins, I'm playing. I don't care."
Apart from the crushing 29 winners, mostly from his lethal forehand wing, the most impressive aspect about Chung's performance was mental application.
There was no hint of a psychological let-down as he shrugged off world No.97 Sandgren to sweep into the last four.
Chung took up tennis after a doctor recommended peering at a green court would help his weak eyesight.
Quickly marked out as a player of rare quality, the Korean showed glimpses of his best last season before winning the Next-Gen Finals in Milan.
Wins in the round-robin over fellow young guns Denis Shapovalov, Andrey Rublev (twice) and Medvedev gave Chung the self-belief to attack the new season with gusto.
At 21 and 254 days, Chung is also the youngest men's grand slam semi-finalist since Cilic at the 2010 Australian Open.
Sandgren, 26, was far from disgraced.
Having failed on 13 previous occasions to qualify for a grand slam, the American had never won a match at the majors.
But with wins over 2014 champion Stan Wawrinka, fifth seed Dominic Thiem, Maximilian Marterer and Jeremy Chardy, the American earned more than $400,000.
He bravely saved five match points, momentarily spooking the relentless Chung.
"I don't know in last game 40-love up, I start thinking what I had to do in ceremony, something like that," Chung said.
"After the deuce point, no ceremony. I'm just trying to stay focused because I'm first time in these (big) matches."
Sandgren described Chung as "a fantastic player."
"This is the second time I played him now in two weeks. It's fun. It's such a fun challenge because he does so many cool things with how he moves and how he returns and how he plays with his forehand," he said.
"So it was kind of like an extremely difficult puzzle to try to figure out. I wasn't able to figure it out, but I enjoyed trying.
"He kind of forces you, I mean me, to kind of play on this edge where you're kind of doing some really cool things, and then you can fall off it and make some mistakes because he's forcing you to play so well."