Jumpei Yamasaki vs N. Koizumi | M15 Yanagawa City Round of 16

UMPIRY

M15 Yanagawa CityR16HardThu 29 Oct · 10:00

Jumpei YamasakiJPN73%

VSClear favourite · Yamasaki J.

N. Koizumi(7)JPN27%

Win probabilityWho is more likely to winClear favourite · Yamasaki J.

73%27%

Clear edge for Yamasaki J. across form, surface and matchup. Upsets at this level happen in about 1 in 4 such matches.

Umpiry ScoreMatchup strength, 0–10 · not a probability

Yamasaki J.4.3/10

Heavy underdogBased on 5/6 signal groups5/6

Koizumi N.4.6/10

Heavy underdogBased on 5/6 signal groups5/6

Why

Surface form4 of last 10 on hardInformative

Recent runLost last 2Informative

Head-to-headNo prior meetingsBoth players

This eventDidn't play here last yearBoth players

ELO1 611

Hard ELO1 595

Last 105–5

Age29

ELO1 528

Hard ELO1 519

Last 106–4

Age23

Jumpei Yamasaki faces N. Koizumi in the M15 Yanagawa City round of 16 on hard. Recent hard form is closely matched.

Key context

Last match: Jumpei Yamasaki edged James Connel in two tight sets (6–4 7–5).
Fatigue load: Both played one three-setter in the past fortnight — neither arrives fresh.
Surface form: Jumpei Yamasaki 5 of 10, N. Koizumi 6 of 10 on hard recently — N. Koizumi the sharper of late.

Common opponents

0 shared · last 12 months

No common opponents in the last 12 months. Surface form and ELO carry more weight here.

Head-to-head

They have not met before.

Evidence

Yamasaki J.Koizumi N.

FormLast 10 matches each · 2026

Win–loss5–56–4

Season win rate44% (4–5)61% (11–7)

RatingUmpiry ELO

Overall ELO16111528

Hard-court ELO15951519

Serve vs returnLast 7 vs 8 matches

1st-serve points won62%61%

Return points won38%43%

Aces / match4.31.4

ClutchLast 7 vs 8 matches

Break points saved62%57%

Draw

Odds

Conditions

10:00 local

SurfaceHard

Forecast17°C · Mainly clear

Wind3 km/h

Humidity60%

Cite this

Umpiry, "Jumpei Yamasaki vs N. Koizumi — M15 Yanagawa City Round of 16", https://umpiry.com/match/2026-10-29/koizumi-vs-yamasaki-m15-yanagawa-city-r16?utm_source=cite (as of 29 October 2026).