Mirra Andreeva breaks into Top 15 for first time, Naomi Osaka returns to Top 50

An action-packed first week of the 2025 tennis season is in the books, and with that, a number of players make notable moves on the first new rankings of the year today.

Let’s start with 17-year-old Mirra Andreeva, who reached the semifinals of the WTA 500 event in Brisbane before falling to the eventual champion, Aryna Sabalenka. With that result, the ultra-talented rising star breaks into the Top 15 of the WTA rankings for the first time, moving up from No. 16 to No. 15.

Andreeva first appeared on the rankings in 2022, and now—less than three years later—she’s already in the Top 15. She broke into the Top 300 in 2022, the Top 200, Top 100 and Top 50 in 2023, and made it all the way into the Top 20 by the end of 2024 after a season highlighted by her first major semifinal at Roland Garros and her first WTA title in Iasi, Romania.

And she’s not just the youngest player in the Top 15, she’s the youngest player in the Top 150. You have to go all the way down to No. 177 to find someone younger in Alina Korneeva, who was born eight weeks after Andreeva in 2007.

Meanwhile, there’s a silver lining for Naomi Osaka’s unlucky ending in Auckland, where she was forced to retire after winning the first set of the final due to an abdominal injury.

By reaching the final of the Australian Open lead-up event, which was her first final since Miami in 2022, Osaka secured a return to the Top 50—she rises from No. 57 to No. 50 today.

The former world No. 1 returned to the tour at the start of 2024 unranked after 15 months of maternity leave, and now, just a year later, she’s already back inside the Top 50.

Just a few spots below Osaka there’s a big Top 100 debut, as Polina Kudermetova—younger sister of former Top 10 player Veronika Kudermetova—soars from No. 107 to No. 57 after coming through qualifying and making it all the way to her first WTA final in Brisbane, where she fell to Sabalenka.

The Kudermetovas are now one of two pairs of sisters currently in the Top 100, with 21-year-old Polina ranked No. 57 and 27-year-old Veronika at No. 77. The Andreeva sisters are the other pair, with 17-year-old Mirra No. 15 and 20-year-old Erika No. 86.

Over on the ATP rankings, Kei Nishikori—who returned to the tour in 2024 after hip, ankle and knee injuries marred his 2022 and 2023 seasons—soars back into the Top 100 this week, rising from No. 106 to No. 74 after reaching the final in Hong Kong, which was his first ATP final in six years, since capturing his 12th and most recent ATP title in Brisbane in 2019.

It’s his first time in the Top 100 since the week of June 6th, 2022. He was unranked for eight months between 2022 and 2023.

And the man who beat the former world No. 4 for the Hong Kong title, France’s Alexandre Muller, is now on the cusp of the Top 50, rising from his previous career-high of No. 67 to a new personal best of No. 56 after capturing the first tour-level title of his career at the ATP 250 hard-court event.