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Melbourne - South Korea's Chung Hyeon beat Novak Djokovic and Alexander Zverev en route to a semi-final last year but was within a whisker of failing to get past the Australian Open first round on Tuesday.
Cheered on by massed ranks of Korean supporters on Court 8, the 24th seed mounted an epic fightback from two sets down against American Bradley Klahn to win 6-7 (5/7), 6-7 (5/7), 6-3, 6-2, 6-4.
Gritty Chung held both arms aloft and looked to the sky in triumph as he converted on match point after 3hr and 37min and then was swamped by ecstatic fans waving Korean flags and clamouring for autographs as he tried to leave the court.
The 22-year-old, who was the 2017 ATP NextGen Finals champion, was forced to retire from his semi-final last year with eventual champion Roger Federer because of injury.
He will play world number 55 Pierre-Hugues Herbert of France in the second round.
Results from Day 2 of the Australian Open on Tuesday:
Men's singles
1st round
David Goffin (BEL x21) bt Christian Garn (CHI) 6-0, 6-2, 6-2
Ryan Harrison (USA) bt Jiri Vesely (CZE) 6-0, 7-5, 6-3
Daniil Medvedev (RUS x15) bt Lloyd Harris (RSA) 6-1, 6-2, 6-1
Fabio Fognini (ITA x12) bt Jaume Munar (ESP) 7-6 (7/3), 7-6 (9/7), 3-1 retired
Leonardo Mayer (ARG) bt Nicolas Jarry (CHI) 7-6 (7/4), 7-6 (7/3), 4-6, 6-3
Ilya Ivashka (BLR) bt Malek Jaziri (TUN) 4-6, 7-6 (8/6), 6-1, 4-0 retired
Ivo Karlovic (CRO) bt Hubert Hurkacz (POL) 6-7 (5/7), 7-6 (7/5), 7-6 (7/3), 7-6 (7/5)
Kei Nishikori (JPN x8) bt Kamil Majchrzak (POL) 3-6, 6-7 (6/8), 6-0, 6-2, 3-0 retired
Alexander Zverev (GER x4) bt Aljaz Bedene (SLO) 6-4, 6-1, 6-4
Alex Bolt (AUS) bt Jack Sock (USA) 4-6, 6-3, 6-2, 6-2
Gilles Simon (FRA x29) bt Bjorn Fratangelo (USA) 7-6 (7/2), 6-4, 6-2
Pierre-Hugues Herbert (FRA) bt Sam Querrey (USA) 5-7, 7-6 (8/6), 6-3, 6-1
Borna Coric (CRO x11) bt Steve Darcis (BEL) 6-1, 6-4, 6-4
Marton Fucsovics (HUN) bt Albert Ramos (ESP) 6-3, 6-4, 6-7 (5/7), 6-3
Pablo Carreno-Busta (ESP x23) bt Luca Vanni (ITA) 6-7 (5/7), 2-6, 6-3, 7-5, 6-4
Joao Sousa (POR) bt Guido Pella (ARG) 7-6 (7/2), 4-6, 7-6 (7/5), 4-6, 6-2
Ivo Karlovic (CRO) bt Hubert Hurkacz (POL) 6-7 (5/7), 7-6 (7/5), 7-6 (7/3), 7-6 (7/5)
Chung Hyeon (KOR x24) bt Bradley Klahn (USA) 6-7 (5/7), 6-7 (5/7), 6-3, 6-2, 6-4
Evgeny Donskoy (RUS) bt Laslo Djere (SRB) 6-7 (5/7), 6-4, 6-1, 7-6 (7/5)
Women's singles
1st round
Carla Suarez (ESP x23) bt Clara Burel (FRA) 7-5, 6-2
Eugenie Bouchard (CAN) bt Peng Shuai (CHN) 6-2, 6-1
Serena Williams (USA x16) bt Tatjana Maria (GER) 6-0, 6-2
Timea Bacsinszky (SUI) bt Darya Kasatkina (RUS x10) 6-3, 6-0
Johanna Konta (GBR) bt Ajla Tomljanovic (AUS) 7-6 (7/4), 2-6, 7-6 (10/7)
Garbine Muguruza (ESP x18) bt Zheng Saisai (CHN) 6-2, 6-3
Madison Brengle (USA) bt Misaki Doi (JPN) 6-4, 6-0
Karolina Pliskova (CZE x7) bt Karolina Muchova (CZE) 6-3, 6-2
Wang Qiang (CHN x21) bt Fiona Ferro (FRA) 6-4, 6-3
Aleksandra Krunic (SRB) bt Zarina Diyas (KAZ) 3-6, 7-5, 6-1
Anastasija Sevastova (LAT x13) bt Mona Barthel (GER) 6-3, 6-1
Elise Mertens (BEL x12) bt Anna Karolina Schmiedlova (SVK) 6-2, 7-5
Anastasia Potapova (RUS) bt Pauline Parmentier (FRA) 6-4, 7-6 (7/5)
Madison Keys (USA x17) bt Destanee Aiava (AUS) 6-2, 6-2
Natalia Vikhlyantseva (RUS) bt Varvara Lepchenko (USA) 6-7 (2/7), 6-2, 6-4
Camila Giorgi (ITA x27) bt Dalila Jakupovic (SLO) 6-3, 6-0
Tamara Zidansek (SLO) bt Daria Gavrilova (AUS) 7-5, 6-3
Huieh Su-wei (TPE x28) bt Stefanie Vogele (SUI) 6-2, 6-1
