Jan Kumstat vs Sumit Nagal Prediction (Aug 1, 2026)
Result: Jan Kumstat won. We gave Jan Kumstat 29% before the match, so our pick (Sumit Nagal) was wrong.
Brier score (lower is better): ours 0.497, market six hours out 0.240.
| Our model | Sumit Nagal 71% · Jan Kumstat 29% |
| Market price at our call | Sumit Nagal 46% |
| Event | ATP Challenger · Clay |
| Scheduled start | Sat Aug 1, 2026, 08:10 AM ET |
| Call logged | 2026-07-31 21:34 UTC (before first serve) |
Every call we make is logged before the match and graded after it. See the live tennis board, the full match list and our public track record.
All ATP Challenger 2026 predictions · Jan Kumstat predictions
More matches on Aug 1:
- Cameron Norrie vs Denis Shapovalov
- Gonzalo Bueno vs Norbert Gombos
- Taylor Fritz vs Brandon Nakashima
- Federico Agustin Gomez vs Jan Choinski
- Benjamin Bonzi vs Hugo Dellien
- Adolfo Daniel Vallejo vs Juncheng Shang
- Adam Walton vs Justin Boulais
- Martin Damm vs Henrique Rocha
- Dane Sweeny vs Shintaro Mochizuki
- Marco Trungelliti vs Nicolas Mejia
- Marcos Giron vs Pablo Llamas Ruiz
- Michael Zheng vs Kei Nishikori
- Dalibor Svrcina vs Titouan Droguet
- Jacob Fearnley vs Sebastian Ofner
- Juan Pablo Varillas vs Mili Poljicak
- Alexei Popyrin vs Thanasi Kokkinakis
- Nicolai Budkov Kjaer vs Sho Shimabukuro
- Rafael Jodar vs Alejandro Tabilo
- Facundo Diaz Acosta vs Vilius Gaubas
- Christopher O'Connell vs Jaime Faria
- Aleksandr Shevchenko vs Kyrian Jacquet
- Aleksandar Vukic vs Tomas Barrios Vera
- Denis Shapovalov vs Arthur Gea
- Mark Lajal vs J.J. Wolf
- Harriet Dart vs Sloane Stephens
- Darja Vidmanova vs Renata Zarazua
- Alexandra Eala vs Naomi Osaka
- Maddison Inglis vs Taylah Preston
Regulatory Disclosures, Safe-Harbor & Terms of Use
1. Analytical & Research Use Only: iPredictSport is a quantitative research platform publishing statistical estimates for educational, informational, and analytical purposes only. iPredictSport is not an investment adviser, commodity trading advisor (CTA), registered broker-dealer, or sports wagering operator. Nothing contained on this site, in our API, or in our newsletters constitutes financial advice, investment recommendations, or sports betting advice.
2. Hypothetical & Simulated Performance (CFTC Rule 4.41): Performance figures for our autonomous paper agent and proposed bet track records are simulated, hypothetical, and based on paper audits. Unlike an actual performance record, simulated results do not represent actual trading, may not reflect market liquidity, exchange slippage, or trading bans, and cannot account for psychological risk factors. No representation is made that any user will or is likely to achieve profits or losses similar to those shown. Past performance does not guarantee future results.
3. Market Risk & Capital Loss: Trading binary contracts on prediction markets (such as Kalshi or Polymarket) or placing sports wagers involves substantial financial risk, including the possible loss of 100% of staked capital. Odds and spreads fluctuate continuously. Users assume sole responsibility for their own trading decisions and bankroll sizing.
4. Responsible Gaming & Age Requirements: Fliff sweepstakes is available to legal residents aged 18+ in eligible states. Financial prediction exchanges (including Kalshi) require 18+, and commercial sportsbooks require 21+, subject to jurisdiction. If you or someone you know has a gambling problem and wants help, confidential crisis counseling and referral services can be accessed 24/7 by calling 1-800-GAMBLER (1-800-426-2537) or visiting ncpgambling.org.
5. Affiliate & Compensation Disclosure: iPredictSport may receive affiliate commissions, referral fees, or cost-per-acquisition (CPA) compensation from links to partners (including Fliff, Kalshi, and Polymarket) at no additional cost to you. For Fliff, attribution requires entry of promo code IPREDICT or IPSLIVE in the mobile app. Fliff is a sweepstakes sports product for adults 18+ and is void where prohibited by law (18 excluded states). This commercial compensation does not alter our objective quantitative probabilities, model outputs, or editorial gates.
Full text: Terms of Use · Disclaimer · Affiliate & Advertising Disclosure · Privacy Policy