Melbourne - Two-time Wimbledon champion Petra Kvitova strolled into the Australian Open second round with a straight sets win over Magdelena Rybarikova of Slovakia on Monday.
The Czech eighth seed struggled with her serve early in the match before finding her rhythm for a 6-3, 6-2 victory.
The 28-year-old has been in strong form leading into the season-opening Grand Slam, winning last week's Sydney International and will next play Irina-Camelia Begu.
Her best result at Melbourne Park is a run to the semi-finals in 2012.
Stefanos Tsitsipas (GRE x14) bt Matteo Berrettini (ITA) 6-7 (3/7), 6-4, 6-3, 7-6 (7/4)
Reilly Opelka (USA) bt John Isner (USA x9) 7-6 (7/4), 7-6 (8/6), 6-7 (4/7), 7-6 (7/5)
Yulia Putintseva (KAZ) bt Barbora Zahlavova Strycova (CZE x32) 6-4, 7-6 (7/1)
Lesya Tsurenko (UKR x24) bt Ekaterina Alexandrova (RUS) 6-4, 7-6 (7/4)