Katie Boulter vs Katerina Siniakova — Japan Open - Osaka Semi-final
Katie Boulter faces Katerina Siniakova in the Japan Open - Osaka semi-final on hard. Katie Boulter holds the paper edge — ranked #58, leading the head-to-head 1–0. Recent hard form is closely matched.
Key context
- Last match: Katie Boulter dropped the opening set before beating Antonia Ruzic 3–6 6–3 6–3.
- Last match: Katerina Siniakova dropped just 3 games past Mary Stoiana.
- Fatigue load: Katerina Siniakova carries the heavier recent load — 2 three-setters to 1 in the past fortnight.
Live Win Probability
iSiniakova K. came in with the higher hard rating (1777 vs 1766) and the better recent record (6–4 vs 5–5); Boulter K. with the head-to-head lead (1–0).
Pre-match prediction
Set before the first ball · not updated in playCommon opponents
7 shared · last 12 monthsBoulter K. and Siniakova K. faced 7 of the same opponents in the last 12 months. Boulter K. went 4–4 (50%) against them, Siniakova K. 3–6 (33%). Results against comparable opponents are close (1 : 1 better-results split).
vs Pegula J.#4L4-6 4-6Madrid · clayL2-6 4-6Berlin · grass
vs Svitolina E.#6L5-7 4-6Auckland · hardL1-6 1-1Indian Wells · hard
vs Shnaider D.#13L3-6 1-6Wuhan · hardL1-6 6-2 5-7Adelaide · hard
Show 4 more ▾Show less ▴
vs Fernandez L.#30W3-6 7-6(4) 7-5London · grassW5-7 6-4 7-6Indian Wells · hard
vs Tauson C.#54W6-7 6-4 1-0Miami · hardW6-4 6-1Doha · hard
vs Osorio C.#67W6-3 0-0Merida · hardL2-6 7-5 3-6Doha · hard
vs Bouzas Maneiro J.#96W7-6 6-4Miami · hardW6-7(5) 6-1 6-1Cincinnati · hard
Season statistics
Form · Rating · Serve vs return · ClutchShowHide
Draw
Cite this
Umpiry, "Katie Boulter vs Katerina Siniakova — Japan Open - Osaka Semi-final", https://umpiry.com/match/2026-10-24/boulter-vs-siniakova-japan-open-osaka-sf?utm_source=cite (as of 24 October 2026).