Japan’s Naomi Osaka opened her defence of the Australian Open title with a dominant win over Colombia’s Camila Osorio on day one in Melbourne.
Osaka, also champion in 2019, raced into a 5-0 lead in the first set before world number 50 Osorio fought back.
American Sofia Kenin, who won the title in 2020, suffered an early exit for the second year in a row as she was beaten by compatriot Madison Keys.
Former US Open finalist Keys beat 11th seed Kenin 7-6 (7-2) 7-5.
Osaka, seeded 13th, is returning to Grand Slam action after taking a four-month break at the end of last season to protect her mental health.
The four-time Grand Slam champion will play American world number 54 Madison Brengle in round two on Wednesday.
Brengle, 31, progressed after Ukrainian opponent Dayana Yastremska retired when trailing 6-1 0-6 5-0.
