Melbourne - Former world number one and two-time champion Victoria Azarenka was dumped from the Australian Open at the first hurdle Tuesday, throwing away a one-set lead against Laura Siegemund.
The Belarusian, who has tumbled down the rankings since the birth of son Leo and a messy custody battle afterwards, slumped out 6-7 (5/7), 6-4, 6-2.
Germany's Siegemund trailed 4-2 in the second set before finding her second wind to come out on top of the almost three-hour marathon.
"I played a good first set and even though I was up in the tiebreak, I let go a little bit and she was right there," said the world 110.
"I kind of reset myself and knew I was playing a good match, and I just had to close in those situations."
The win was her first at a major since the 2016 US Open, as continues to work her way back from a major knee injury in early 2017.
For Azarenka, it was her worst performance at Melbourne Park since a first-round exit on her debut in 2006.
She won the title in 2012 and 2013, but missed the last two tournaments because of giving birth and the custody battle.
Results from Day 2 of the Australian Open on Tuesday:
Men
Round 1
Taro Daniel (JPN) bt Thanasi Kokkinakis (AUS) 5-7, 4-2 retired
Denis Shapovalov (CAN x25) bt Pablo Andujar (ESP) 6-2, 6-3, 7-6 (7/3)
David Goffin (BEL x21) bt Christian Garin (CHI) 6-0, 6-2, 6-2
Marius Copil (ROU) bt Marcel Granollers (ESP) 6-3, 6-4, 6-4
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
Pablo Carreño-Busta (ESP x23) bt Luca Vanni (ITA) 6-7 (5/7), 2-6, 6-3, 7-5, 6-4
Philipp Kohlschreiber (GER x32) bt Zhe Li (CHN) 6-2, 6-2, 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)
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
Hyeon Chung (KOR x24) bt Bradley Klahn (USA) 6-7 (5/7), 6-7 (5/7), 6-3, 6-2, 6-4
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
Evgeny Donskoy (RUS) bt Laslo Djere (SRB) 6-7 (5/7), 6-4, 6-1, 7-6 (7/5)
Lucas Pouille (FRA x28) bt Mikhail Kukushkin (KAZ) 6-1, 7-5, 6-4
Alexei Popyrin (AUS) bt Mischa Zverev (GER) 7-5, 7-6 (9/7), 6-4
Stan Wawrinka (SUI) bt Ernests Gulbis (LAT) 3-6, 3-1 retired
Women
Round 1
Alize Cornet (FRA) bt Lara Arruabarrena (ESP) 6-2, 6-2
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
Natalia Vikhlyantseva (RUS) bt Varvara Lepchenko (USA) 6-7 (2/7), 6-2, 6-4
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
Camila Giorgi (ITA x27) bt Dalila Jakupovic (SLO) 6-3, 6-0
Madison Brengle (USA) bt Misaki Doi (JPN) 6-4, 6-0
Karolina Pliskova (CZE x7) bt Karolina Muchova (CZE) 6-3, 6-2
Tamara Zidansek (SLO) bt Daria Gavrilova (AUS) 7-5, 6-3
Laura Siegemund (GER) bt Victoria Azarenka (BLR) 6-7 (5/7), 6-4, 6-2
Hsieh Su-wei (TPE x28) bt Stefanie Vögele (SUI) 6-2, 6-1
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
Bianca Andreescu (CAN) bt Whitney Osuigwe (USA) 7-6 (7/1), 6-7 (0/7), 6-3
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
Elina Svitolina (UKR x6) bt Viktorija Golubic (SUI) 6-1, 6-2
Venus Williams (USA) bt Mihaela Buzarnescu (ROU x25) 6-7 (3/7), 7-6 (7/3), 6-2