The 19-year-old American built a 4-2 lead in the second set before a lengthy back-and-forth with chair umpire Pierre Bacchi.

The No.3 seed rallied for a 2-6, 6-4, 6-3 win against Pliskova after a heated exchange with French umpire Pierre Bacchi midway through the second set.

Meanwhile, former No. 1 Karolina Pliskova has now more than halved her ranking in just two weeks, from No. 78 to No. 36.

Also, former No. 1 Karolina Pliskova surges back towards the Top 50 after winning her first WTA title in over four years.

The No. 3 seed saved three set points in an opening tie-break before taking control of their first-round clash Tuesday.

Before each day’s play, we’ll preview three must-see matches.

The Australian Open is right around the corner, but wagering this year's Adelaide International should make the time go by a little faster. (Presented by BetMGM)

Pliskova rallied from a set down and struck a whopping 16 aces to win the battle of former world No. 1s, halting Osaka’s return to action from maternity leave.

Osaka drew Germany’s Tamara Korpatsch in the first round of the Brisbane International, her first tournament since becoming a mother, while Nadal will open against a qualifier.

"I believe it's the right decision to focus on my health and come back stronger next season," the Czech wrote on social media.