Naomi Osaka's second-round match at the Australian Open could not possibly have started in a worse way. All of 21 minutes in, she sailed a forehand service return well long and, just like that, trailed 5-0.

A four-time Grand Slam champion, Osaka returned from maternity leave last year and lost in the first or second round of all four major tournaments. The 27-year-old Japan native has not won any event on the WTA Tour since capturing her second Australian Open title to start 2021.

Naomi Osaka beat Karolina Muchova 1-6, 6-1, 6-3 at the Australian Open, reaching the third round at a Grand Slam for the first time since her return from maternity leave.