WTA Tour
Katerina Siniakova won the Japan Open in Osaka on Sunday, beating Ashlyn Krueger 6-1, 6-0 in 64 minutes. After trailing 2-1 in the first set, the Czech won the last 10 games of the match. It is her sixth singles title and her first since Nanchang in 2023, and she beat British No. 8 seed Katie Boulter in the semi-finals.
Ten Games in a Row
Siniakova, the world No. 1 in doubles, dropped one set all week, and that came in her first match, against the No. 2 seed Peyton Stearns, who retired in the third set. In the final she hit 16 winners to Krueger’s 10 and made 19 unforced errors to Krueger’s 34. “I don’t remember when I played so well,” she said afterwards.
Her Route to the Title
| Round | Opponent | Score |
|---|---|---|
| First round | Peyton Stearns (2) | 6-4, 0-6, 4-0, retired |
| Second round | Magda Linette | 6-4, 6-1 |
| Quarter-finals | Mary Stoiana | 6-1, 6-2 |
| Semi-finals | Katie Boulter (8) | 6-1, 6-4 |
| Final | Ashlyn Krueger | 6-1, 6-0 |
Boulter’s Week
Boulter was the No. 8 seed. She beat Himeno Sakatsume 6-3, 6-1 and Viktorija Golubic 6-2, 6-1, then came from a set down to beat Antonia Ruzic 3-6, 6-3, 6-3. Siniakova was too strong in the semi-final. Our story on Sonay Kartal becoming British No. 1 has the latest on the British rankings.
Krueger Falls Short of a Second Osaka Title
Krueger won this event in 2023 and was playing the third tour-level final of her career. She beat three seeds on the way: Janice Tjen (6), Talia Gibson (4) and the top seed Ann Li, 6-4, 6-7(4), 6-3 in the semi-finals.
What Comes Next
Siniakova is entered in the Guangzhou Open this week. The singles season ends with the WTA Finals in Indian Wells from 8 to 15 November.
FAQ
Japan Open Osaka 2026 Final FAQs
Who won the Japan Open in Osaka in 2026?
Katerina Siniakova, who beat Ashlyn Krueger 6-1, 6-0 in the final on 25 October.
How many singles titles has Siniakova won?
Six. Osaka is her first singles title since Nanchang in 2023.
How did Katie Boulter do in Osaka?
She reached the semi-finals as the No. 8 seed and lost 6-1, 6-4 to Siniakova.
Has Ashlyn Krueger won Osaka before?
Yes. She won the title in 2023, and this was the third final of her career.
Where does Siniakova play next?
She is entered in the Guangzhou Open, which runs from 26 October to 1 November.
More Coverage
See Katie Boulter‘s profile and her next match page, the WTA rankings and the 2026 tennis calendar.