WTAHardTokyo2026-10-24 08:30

Katie Boulter v Sayaka Ishii

The market

No published price yet

Percentages are the implied chance of winning with the bookmaker's margin removed.

Recent form

K. BoulterWWWLL

S. IshiiLWLWW

Last five completed matches, most recent first.

Head to head

First career meetingNo previous matches between these two on record.

This season & this event

K. Boulter

S. Ishii

25-22

22-16

Lost R32 to E. Lys

Lost SF to S. Kenin

2026 record

2026 on hard

Here in 2025

Here in 2024

16-20

16-15

Did not play

Lost QF to D. Shnaider

Ranking points fall off a year after they are earned, so a player who went deep here last year must match it or drop in the rankings. That shapes effort in a way the price does not always show.

The players

Katie Boulter

United Kingdom

Sayaka Ishii

Japan

United Kingdom

21–18

13–9

5–6

3–3

Ranking

Age

Country

2026 W/L

Titles

Hard

Clay

Grass

211

Japan

15–16

10–11

0–1

5–4

Ranking, record and surface splits are for the most recent season on file. Height, weight and handedness are not published by our data provider.

K. Boulter — last 10

With the pre-match price we recorded at the time.

Date	Event	Surface	Opponent	Their price	Market	Result
2026-10-23	Osaka	Hard	A. Ruzic	1.53	63%	WON
Games in each set3-6 6-3 6-3 BoulterRuzicPoints won53%47%Serve points won57%51%Return points won49%43%Games held8 of 136 of 13Break points saved4 of 93 of 10Aces42Double faults55
2026-10-21	Osaka	Hard	V. Golubic	1.88	52%	WON
Games in each set6-2 6-1 BoulterGolubicPoints won64%36%Serve points won76%52%Return points won48%24%Games held8 of 83 of 7Break points saved1 of 10 of 4Aces10Double faults30
2026-10-19	Osaka	Hard	H. Sakatsume	1.56	62%	WON
Games in each set6-3 6-1 BoulterSakatsumePoints won56%44%Serve points won60%50%Return points won50%40%Games held7 of 83 of 8Break points saved12 of 134 of 9Aces12Double faults71
2026-10-12	Wuhan	Hard	D. Shnaider	4.37	78%	LOST
Games in each set3-6 1-6 BoulterShnaiderPoints won44%56%Serve points won44%56%Return points won44%56%Games held2 of 86 of 8Break points saved10 of 163 of 5Aces01Double faults44
2026-10-02	Beijing	Hard	K. Muchova	5.63	83%	LOST
Games in each set6-7 1-6 BoulterMuchovaPoints won39%61%Serve points won52%75%Return points won25%48%Games held6 of 99 of 10Break points saved1 of 40 of 1Aces25Double faults53
2026-09-30	Beijing	Hard	M. Hontama	1.41	68%	WON
Games in each set6-3 6-4 BoulterHontamaPoints won53%47%Serve points won60%53%Return points won47%40%Games held7 of 95 of 10Break points saved6 of 83 of 8Aces42Double faults61
2026-09-22	WTA Billie Jean King Cup - World Group	- Qualification	L. Noskova	—	—	LOST
Games in each set2-6 6-7 BoulterNoskovaPoints won46%54%Serve points won67%76%Return points won24%33%Games held8 of 1010 of 10Break points saved4 of 60 of 0Aces415Double faults52
2026-09-02	US Open	Hard	K. Muchova	6.73	86%	LOST
Games in each set1-6 0-6 BoulterMuchovaPoints won32%68%Serve points won29%65%Return points won35%71%Games held0 of 75 of 6Break points saved0 of 72 of 3Aces02Double faults82
2026-08-30	US Open	Hard	C. Y. Lee	—	—	WON
Games in each set6-4 3-6 6-0 BoulterLeePoints won54%46%Serve points won61%52%Return points won48%39%Games held10 of 128 of 13Break points saved5 of 711 of 16Aces08Double faults73
2026-08-15	Cincinnati	Hard	L. Noskova	3.95	75%	LOST
Games in each set3-6 3-6 BoulterNoskovaPoints won43%57%Serve points won52%69%Return points won31%48%Games held5 of 98 of 9Break points saved5 of 91 of 2Aces010Double faults76

S. Ishii — last 10

With the pre-match price we recorded at the time.

Date	Event	Surface	Opponent	Score	Their price	Market	Result
2026-10-18	Osaka	Hard	M. Stoiana		6.86	86%	LOST
Games in each set4-6 5-7 IshiiStoianaPoints won47%53%Serve points won46%51%Return points won49%54%Games held4 of 116 of 11Break points saved3 of 105 of 10Aces11Double faults73
2026-10-17	Osaka	Hard	E. Avanesyan	RET	4.56	79%	WON
Games in each set6-3 IshiiAvanesyanPoints won61%39%Serve points won69%48%Return points won52%31%Games held4 of 52 of 4Break points saved2 of 32 of 4Aces10Double faults22
2026-09-26	W50 Nanao	Hard	H. Abe		—	—	LOST
Games in each set3-6 2-6 IshiiAbePoints won43%57%Serve points won51%64%Return points won36%49%Games held4 of 88 of 9Break points saved4 of 87 of 8
2026-09-25	W50 Nanao	Hard	R. Itaya		1.12	84%	WON
Games in each set6-2 6-0 IshiiItayaPoints won64%36%Serve points won69%39%Return points won61%31%Games held6 of 71 of 7Break points saved1 of 24 of 10
2026-09-24	W50 Nanao	Hard	N. Kawaguchi		2.10	56%	WON
Games in each set5-7 7-6 6-2 IshiiKawaguchiPoints won50%50%Serve points won56%55%Return points won45%44%Games held12 of 1710 of 16Break points saved4 of 95 of 11
2026-09-23	W50 Nanao	Hard	N. Hanatani		1.05	88%	WON
Games in each set7-6 6-2 IshiiHanataniPoints won53%47%Serve points won52%47%Return points won53%48%Games held7 of 114 of 10Break points saved10 of 141 of 7
2026-09-18	W35 Kyoto	Hard	H. Abe		—	—	LOST
Games in each set6-4 4-6 3-6 IshiiAbePoints won49%51%Serve points won54%57%Return points won43%46%Games held8 of 159 of 14Break points saved5 of 121 of 6
2026-09-17	W35 Kyoto	Hard	A. Rajecki		2.20	58%	WON
Games in each set6-7 7-6 6-3 IshiiRajeckiPoints won55%45%Serve points won77%62%Return points won38%23%Games held16 of 1616 of 19Break points saved4 of 45 of 7
2026-09-15	W35 Kyoto	Hard	S. Y. Cheuk		—	—	WON
Games in each set7-6 6-4 IshiiCheukPoints won54%46%Serve points won73%63%Return points won37%27%Games held10 of 119 of 12Break points saved2 of 35 of 7
2026-08-27	W15 Torello	Hard	A. Ferlito Faticanti		—	—	LOST
Games in each set2-6 6-2 4-6 IshiiFaticantiPoints won51%49%Serve points won57%54%Return points won46%43%Games held7 of 138 of 13Break points saved1 of 79 of 14

Also at this event

Samsonova v Watson Starodubtseva v Sasnovich Tsujioka v Rakhimova Joint v Golubic Oliynykova v Hontama Shibahara v Parks