UMPIRY
EN

Z. Viiala vs Samuel Heredia — Champaign Qualifying Round of 32

ChampaignQ32QualifyingHardMon 16 Nov · 18:45
Z. ViialaAUS47%
VSToss-up
Samuel HerediaATP #629 · COL53%
Win probabilityWho is more likely to winToss-up
47%53%

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

Umpiry ScoreMatchup strength, 0–10 · not a probability
Viiala Z.6.1/10
Even matchBased on 5/6 signal groups5/6
Heredia S.5.7/10
Slight disadvantageBased on 5/6 signal groups5/6
Why
Surface form3 of last 8 on hardInformative
Head-to-headNo prior meetingsBoth players
This eventDidn't play here last yearBoth players
ELO1 532
Hard ELO1 529
Last 105–5
Age21
ELO1 525
Hard ELO1 527
Last 102–8
Age20

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

Viiala Z.Heredia S.
FormLast 10 matches each · 2026
Win–loss5–5 (ahead)2–8
Season win rate56% (5–4) (ahead)41% (13–19)
RatingUmpiry ELO
Overall ELO1532 (ahead)1525
Hard-court ELO1529 (ahead)1527
Serve vs returnLast 5 vs 27 matches
1st-serve points won71% (ahead)68%
Return points won34%37% (ahead)
Aces / match4.44.4
ClutchLast 5 vs 27 matches
Break points saved61% (ahead)60%

Draw

Odds

Conditions

18:45 local
SurfaceHard · medium-fast
Forecast5°C · Clear
Wind7 km/h
Humidity54%

Court pace medium-fast: rewards aggression.

Cite this

Umpiry, "Z. Viiala vs Samuel Heredia — Champaign Qualifying Round of 32", https://umpiry.com/match/2026-11-16/heredia-vs-viiala-champaign-q32?utm_source=cite (as of 16 November 2026).