Katie Boulter vs Katerina Siniakova Preview & Prediction | 2026 Japan Women’s Open | Semi-Final

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Katie Boulter meets Katerina Siniakova in the semi-finals at the 2026 Japan Women’s Open at the Utsubo Tennis Center in Osaka, Japan.

Ranking points: WTA 250

Start date/time: 24 October 2026 at 5:30 am

Venue: Utsubo Tennis Center, Osaka, Japan

Surface: Outdoor hard

How to watch on TV: UK – Sky Sports Tennis / USA – Tennis Channel

How to watch online: UK – Sky Go / USA – Tennis Channel

Tickets: Visit this link for the latest Katie Boulter vs Katerina Siniakova ticket information

Katie Boulter vs Katerina Siniakova prediction

Katie Boulter reached her second WTA semi-final of 2026 with a comeback win over Antonia Ruzic.

The Brit dug deep to defeat the Croatian by a 3-6 6-3 6-3 scoreline.

Boulter will now face Katerina Siniakova for a place in the final after the Czech raced to a 6-1 6-2 triumph over Mary Stoiana.

This will be their second meeting with Katie coming out on top 4-6 6-2 6-1 in fast conditions on clay in Madrid last year.

Siniakova has looked sharp this week, but Boulter is the higher-ranked player and seems to have found her confidence here. It’s another one where the form book over recent months probably goes out the window, but a safety net for your bet could be that there's very much scope for a large number of games.

Katie Boulter vs Katerina Siniakova tip: Over 19.5 games