Katie Boulter reclaims British No 1 ranking in Japan Open comeback

Katie Boulter reclaimed the British number one ranking after a dramatic comeback victory at the Japan Open. The 30-year-old defeated Croatia's Antonia Ruzic, ranked 91st in the world, 3-6, 6-3, 6-3 in the Osaka quarter-finals on Friday, 23 October 2026.

Boulter lost the first three games and the opening set. She was then two break points down in the second set, facing the prospect of an early exit. The Briton struggled on serve, winning only 60% of points behind her first delivery and hitting four double faults across the opening two sets. She faced seven break points in that period.

Her fortunes changed dramatically. Boulter broke Ruzic's serve three times in a row in the second set. She held serve in a crucial seventh game after three successive breaks of serve. From there, she won eight straight games, racing to a 4-0 lead in the decider. Boulter wrapped up the match in almost two hours by breaking Ruzic to love at 5-2. The victory marked her third semi-final appearance of the season.

Boulter said she did extremely well to come back into the match in the second set. She attributed the turnaround to staying tough and playing better, acknowledging that two consecutive net cords had helped her break for a 5-3 lead in the second set. She stated she had nothing to lose in her upcoming semi-final.

Ranking implications and national status

The win carries major ranking consequences. Boulter, seeded eighth at the WTA 250 event, entered the match ranked 58th in the world with a 55-point deficit to overcome. She will now climb above compatriot Sonay Kartal when the rankings are updated on Monday, returning to the world's top 50 and rising to at least number 48.

Sonay Kartal had held the British number one ranking for just five days before Boulter reclaimed it. Kartal had taken the top spot after a run to the Wuhan Open final, which earned her 121 points and propelled her to world number 50. Boulter's performance in Osaka has reversed that brief shift in national status.

Semi-final matchup and tournament context

Boulter will face Katerina Siniakova in the semi-finals. Siniakova is currently ranked 86th in singles. This will be Boulter's first semi-final since reaching the same stage at Queen's in June. She also won the title in Ostrava back in February.

The other semi-final in Osaka features an all-American clash between top seed Ann Li and Ashlyn Krueger. The match against Siniakova will be broadcast on Sky Sports. Boulter could further cement her place as Britain's leading player by finishing the 2026 season strongly.