Two-time major champion Naomi Osaka moved on to her fourth coach in less than a year, hiring Wim Fissette, who has worked with several Grand Slam winners in the past.
Osaka's agent confirmed the move Sunday.
Last February, shortly after winning the championship in Melbourne and becoming the first top-ranked tennis player from Japan, Osaka fired coach Sascha Bajin, who also helped her claim the 2018 US Open.
That was followed by a stint with Jermaine Jenkins, who lasted until the 2019 U.S. Open in September.
After that, Osaka was coached by her father, Leonard Francois, and she won her next two tournaments. She finished the year ranked No. 3.
The Australian Open begins Jan. 20.