Naomi Osaka battled through injury to reach the quarterfinals of the Japan Open on Wednesday, choking back tears after hitting the winning shot against defending champion Suzan Lamens.
Top seed Osaka, playing a singles tournament in her native Japan for the first time in three years, won 7-6 (8/6), 3-6, 6-2 to set up a last-eight match against Romania's Jaqueline Cristian.
The former world No 1 was leading 5-0 in the final set in the city of Osaka when she needed a medical timeout to receive treatment on her left leg.
She returned with heavy strapping on her thigh and lost the next two games before closing out the match in 2 hours, 20 minutes.
Four-time Grand Slam champion Osaka hit a backhand winner and then bent over and put her hand to her face before walking to the net appearing to fight back tears.
"It was definitely really difficult. I'm kind of sorry about my attitude," Osaka said in an on-court interview that had to be cut short due to her injury.
The 27-year-old is playing in her first tournament since reaching the US Open semifinals, where she lost to Amanda Anisimova of the United States.
Osaka had not progressed to the second week of a major since winning the Australian Open for a second time in 2021.
HUGE POINT 🔥@naomiosaka goes on to win the tiebreak to go a set up against Lamens.#JapanOpen pic.twitter.com/Z5BjGbEueA
— wta (@WTA) October 15, 2025
Osaka, now ranked 16 in the world, returned to the courts in early 2024 after giving birth to a daughter.
She failed to get past the second round of any Grand Slam last year and lost in the first round of the French Open in May.