Katie Boulter vs Antonia Ruzic | Japan Open

UMPIRY

Japan Open - OsakaQuarter-finalHardFri 23 Oct · ~16:00Center · After 2 matches

Katie Boulter(8)WTA #58 · GBR51%

VSToss-up

Antonia RuzicWTA #91 · CRO49%

Win probabilityWho is more likely to winToss-up

51%49%

No meaningful edge. Serve performance in the first set is the likeliest tiebreaker.

Umpiry ScoreMatchup strength, 0–10 · not a probability

Boulter K.6.4/10

Marginal edge

Ruzic A.4.9/10

Heavy underdog

Why

Surface+78 Hard Elo edgeSupports Boulter K.

Overall ratingOverall Elo 1831Supports Boulter K.

Long matches2 three-setters in 14 daysSupports Boulter K.

Recent run2-match win streakBoth players

Head-to-headNo prior meetingsBoth players

ELO1 880

Hard ELO1 759

Last 105–5

Age30

PlaysRight

EarningsCareer $5.0M2026 $1.0M

ELO1 813

Hard ELO1 707

Last 106–4

Age23

PlaysRight

EarningsCareer $1.7M2026 $993K

Katie Boulter faces Antonia Ruzic in the Japan Open - Osaka quarter-final on hard. Katie Boulter holds the paper edge — ranked #58, a roughly 80-point hard Elo advantage. Recent hard form is closely matched.

Key context

Freshness: Katie Boulter comes in with 1 days of rest and 47 games in 14d, vs Antonia Ruzic's 0 and 92.
Under pressure: In the tight moments, Antonia Ruzic has rated higher under pressure (Clutch Rating 82 vs 52).
Last match: Katie Boulter dropped just 3 games past Viktorija Golubic.

Common opponents

6 shared · last 12 months

Boulter K. and Ruzic A. faced 6 of the same opponents in the last 12 months. Boulter K. went 1–7 (13%) against them, Ruzic A. 3–4 (43%). Ruzic A. came out better against 2 of 6 comparable opponents, Boulter K. against 0 — though 1 of those edges carries caveats (lower-tier event).

1–713%Boulter K. · better vs 0Record vs common opponents3–443%Ruzic A. · better vs 2

Vs common opponents · derived from scorelines

3–15Sets8–10

67–107Games73–80

0–3Tiebreaks0–1

1–1Deciding sets1–2

vs Rybakina E.#1W7-5 2-6 6-4London · grassW5-7 6-4 1-0Dubai · hard
vs Svitolina E.#6L5-7 4-6Auckland · hardL6-3 2-6 3-6Dubai · hard
vs Muchova K.#7L3-6 5-7Miami · hardL0-6 3-6Indian Wells · hard

Show 3 more ▾Show less ▴

vs Krueger A.#55L6-3 2-6 2-6Washington · hardW3-6 6-2 6-2Roland Garros · clay
vs Ruse G.#60L6-7 6-7Linz · hardL3-6 6-4 0-6Madrid · clay
vs Podrez V.#124L4-6 1-6Rouen · clayW6-1 6-1Angers 125 · hard

Head-to-head

They have not met before.

Evidence

Boulter K.Ruzic A.

FormLast 10 matches each · 2026

Win–loss5–56–4

Season win rate54% (25–21)47% (24–27)

RatingUmpiry ELO

Overall ELO18801813

Hard-court ELO17591707

Serve vs returnLast 44 vs 49 matches

1st-serve points won67%58%

Return points won43%43%

Aces / match2.31.3

ClutchLast 44 vs 49 matches

Break points saved55%55%

When it starts

Center · After 2 matches · Followed by

1Li A. v Tagger L.Starting at 11:30 AM
2Gibson T. v Krueger A.Followed by
3This match: Boulter K. v Ruzic A.This match

Draw

Odds

Conditions

Center · ~16:00 local

SurfaceHard

Forecast21°C · Partly cloudy

Wind9 km/h

Humidity73%

Freshness

Last 7 & 14 days

Boulter K.Ruzic A.

1Days since last match0

2Matches · 7 days3

31Games · 7 days71

3Matches · 14 days4

47Games · 14 days92

Green marks the fresher player.

Cite this

Umpiry, "Katie Boulter vs Antonia Ruzic — Japan Open - Osaka Quarter-final", https://umpiry.com/match/2026-10-23/boulter-vs-ruzic-japan-open-osaka-qf?utm_source=cite (as of 23 October 2026).