Melbourne - World No 2 Karolina Pliskova barrelled into the Australian Open second round on Tuesday as she chases her first Grand Slam crown.

The 27-year-old Czech defeated France's Kristina Mladenovic 6-1, 7-5 and plays Germany's Laura Siegemund or American wildcard CoCo Vandeweghe next in Melbourne.

Pliskova, whose best Grand Slam appearance was a defeat to Angelique Kerber in the final of the 2016 US Open, called it a "tough test" against 41st-ranked Mladenovic.

"We had some good matches in the past and it was tough mentally in the second set," said Pliskova, who beat Naomi Osaka on the way to winning the Brisbane title this month.

Pliskova, a semi-finalist in Melbourne last year, said the Brisbane triumph had no bearing on the next fortnight.

"It's a new beginning here so weeks before do not count and nobody remembers," she said.

Results on day two of the Australian Open Grand Slam at Melbourne Park on Tuesday:

Men's singles

First round

Rafael Nadal (ESP x1) bt Hugo Dellien (BOL) 6-2, 6-3, 6-0

Pablo Carreno-Busta (ESP x27) bt Jozef Kovalik (SVK) 6-4, 3-6, 6-1, 7-6 (7/2)

Mikael Ymer (SWE) bt Yasutaka Uchiyama (JPN) 6-4, 6-1, 6-2

Karen Khachanov (RUS x16) bt Mario Vilella (ESP) 4-6, 6-4, 7-6 (7/4), 6-3

Dominic Thiem (AUT x5) bt Adrian Mannarino (FRA) 6-3, 7-5, 6-2

Stanislas Wawrinka (SUI x15) bt Damir Dzumhur (BIH) 7-5, 6-7 (4/7), 6-4, 6-4

Tennys Sandgren (USA) bt Marco Trungelliti (ARG) 6-1, 6-4, 7-5

Jordan Thompson (AUS) bt Alexander Bublik (KAZ) 6-4, 6-3, 6-2

Fabio Fognini (ITA x12) bt Reilly Opelka (USA) 3-6, 6-7 (3/7), 6-4, 6-3, 7-6 (10/5)

Jannik Sinner (ITA) bt Max Purcell (AUS) 7-6 (7/2), 6-2, 6-4

Tommy Paul (USA) bt Leonardo Mayer (ARG) 4-6, 6-4, 6-4, 6-4

Hubert Hurkacz (POL x31) bt Dennis Novak (AUT) 6-7 (4/7), 1-6, 6-2, 6-3, 6-4

John Millman (AUS) bt Ugo Humbert (FRA) 7-6 (7/3), 6-3, 1-6, 7-5

Filip Krajinovic (SRB) bt Quentin Halys (FRA) 7-6 (9/7), 7-6 (7/1), 3-6, 4-6, 7-5

Christian Garin (CHI) bt Stefano Travaglia (ITA) 6-4, 6-3, 6-4

Milos Raonic (CAN x32) bt Lorenzo Giustino (ITA) 6-2, 6-1, 6-3

Benoit Paire (FRA x21) bt Cedrik-Marcel Stebe (GER) 6-4, 3-6, 6-3, 6-7 (2/7), 6-0

Marin Cilic (CRO) bt Corentin Moutet (FRA) 6-3, 6-2, 6-4

Michael Mmoh (USA) bt Pablo Andujar (ESP) 6-1, 6-4, 6-4

Roberto Bautista (ESP x9) bt Feliciano Lopez (ESP) 6-2, 6-2, 7-5

Diego Schwartzman (ARG x14) bt Lloyd Harris (RSA) 6-4, 6-2, 6-2

Alejandro Davidovich (ESP) bt Norbert Gombos (SVK) 4-6, 6-4, 2-6, 6-3, 6-2

Marc Polmans (AUS) bt Mikhail Kukushkin (KAZ) 6-4, 6-3, 4-6, 6-7 (8/10), 6-4

Dusan Lajovic (SRB x24) bt Kyle Edmund (GBR) 7-6 (9/7), 6-3, 7-6 (7/4)

Tatsuma Ito (JPN) bt Prajnesh Gunneswaran (IND) 6-4, 6-2, 7-5

Women's singles

First round

Polona Hercog (SLO) bt Rebecca Peterson (SWE) 6-3, 6-3

Greet Minnen (BEL) bt Aliaksandra Sasnovich (BLR) 7-6 (7/3), 4-6, 7-5

Elena Rybakina (KAZ x29) bt Bernarda Pera (USA) 6-3, 6-2

Alison Riske (USA x18) bt Wang Yafan (CHN) 7-6 (7/5), 2-6, 6-3

Madison Keys (USA x10) bt Darya Kasatkina (RUS) 6-3, 6-1

Arantxa Rus (NED) bt Magda Linette (POL) 1-6, 6-3, 6-4

Nao Hibino (JPN) bt Peng Shuai (CHN) 4-6, 7-6 (8/6), 6-3

Maria Sakkari (GRE x22) bt Margarita Gasparyan (RUS) 6-2, 6-2

Ons Jabeur (TUN) bt Johanna Konta (GBR x12) 6-4, 6-2

Caroline Garcia (FRA) bt Madison Brengle (USA) 6-7 (5/7), 6-2, 6-2

Dayana Yastremska (UKR x23) bt Kaja Juvan (SLO) 6-1, 6-1

Wang Qiang (CHN x27) bt Pauline Parmentier (FRA) 7-6 (7/2), 6-3

Fiona Ferro (FRA) bt Alison Van Uytvanck (BEL) 6-2, 6-1

Belinda Bencic (SUI x6) bt Anna Karolina Schmiedlova (SVK) 6-3, 7-5

Jelena Ostapenko (LAT) bt Liudmila Samsonova (RUS) 6-1, 6-4

Donna Vekic (CRO x19) bt Maria Sharapova (RUS) 6-3, 6-4

Ajla Tomljanovic (AUS) bt Anastasija Sevastova (LAT x31) 6-1, 6-1

Karolina Pliskova (CZE x2) bt Kristina Mladenovic (FRA) 6-1, 7-5