UMPIRY
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Honori Koyama vs Sijia Wei — W15 Shenzhen Round of 16

W15 ShenzhenR16HardThu 15 Oct · 12:30
Honori KoyamaJPN7%
VSStrong favourite · Wei S.
Sijia Wei(2)WTA #383 · CHN93%
Win probabilityWho is more likely to winStrong favourite · Wei S.
7%93%

Clear edge for Wei S. across form, surface and matchup. Upsets at this level happen in about 1 in 14 such matches.

Umpiry ScoreMatchup strength, 0–10 · not a probability
Koyama H.5.5/10
Slight disadvantageBased on 5/6 signal groups5/6
Wei S.4.6/10
Heavy underdogBased on 5/6 signal groups5/6
Why
Surface form3 of last 10 on hardInformative
Long matches1 three-setter in 14 daysInformative
Head-to-headNo prior meetingsBoth players
This eventDidn't play here last yearBoth players
ELO1 488
Hard ELO1 488
Last 104–6
Age20
ELO1 676
Hard ELO1 651
Last 107–3
Age22

Honori Koyama faces Sijia Wei in the W15 Shenzhen round of 16 on hard. Sijia Wei brings the better recent hard form (7 of 10).

Key context

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

Koyama H.Wei S.
FormLast 10 matches each · 2026
Win–loss4–67–3 (ahead)
Season win rate42% (8–11)53% (16–14) (ahead)
RatingUmpiry ELO
Overall ELO14881676 (ahead)
Hard-court ELO14881651 (ahead)
Serve vs returnLast 11 vs 24 matches
1st-serve points won56%63% (ahead)
Return points won49% (ahead)45%
Aces / match0.72.0 (ahead)
ClutchLast 11 vs 24 matches
Break points saved59% (ahead)51%

Draw

Odds

Conditions

12:30 local
SurfaceHard
Forecast29°C · Mainly clear
Wind14 km/h
Humidity58%

Cite this

Umpiry, "Honori Koyama vs Sijia Wei — W15 Shenzhen Round of 16", https://umpiry.com/match/2026-10-15/koyama-vs-wei-w15-shenzhen-r16?utm_source=cite (as of 15 October 2026).