Former world No. 1 Naomi Osaka has fallen outside the top 10 in the WTA women's singles rankings for the first time in three years.

In the latest rankings released Monday, Osaka dropped from seventh to 12th, while the top three -- Ashleigh Barty, Aryna Sabalenka and Karolina Pliskova -- remained unchanged.

The last time Osaka ranked outside the top 10 was in August 2018, when she was 19th.

The 23-year-old, who is of Haitian and Japanese descent, said she wanted to take a break from competitive tennis "for a while" following her U.S. Open third-round loss last month to unseeded Canadian teenager Leylah Fernandez, the tournament's eventual runner-up.

The four-time Grand Slam champion pulled out of the French Open in May ahead of her second-round match to take a mental health break. She also sat out Wimbledon, but participated in the Tokyo Olympics in late July, where she lost in a stunning third-round upset.

The favorite to win gold on home soil, Osaka lit the Olympic cauldron at the Tokyo Games opening ceremony in July.

Related coverage:

Ohtani, Osaka headline TIME's 100 most influential people of 2021

Tennis: Naomi Osaka may take indefinite break after shock U.S. Open loss