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US Open Tennis Predictions: Monday best bets featuring Jannik Sinner Day 9
Updated: | First published:
Written by Jason Bevilacqua, Head of Content and Communities
Reviewed by Nick Slade
The US Open is underway as the final grand slam of the year is up and rolling in Flushing, NY and we have your Day 9 guide to betting on the tournament.
The 2025 US Open continues in New York City on Monday, September 1 for Day 9 at Flushing Meadows. The fourth and final Grand Slam of the year runs through to Championship Sunday on September 7 and as the tournament advances, we have the latest US Open best bets and tennis predictions.
The Dimers model has gotten off to a hot start, including a 2-0 day on our best High Value bets from Day 3 of the US Open, nailing Jannik Sinner as our top bet on Day 5 and another 2-0 result on Day 6 with bets on Carlos Alcaraz and Novak Djokovic.
Yesterday's Round of 16 games went pretty much all to script for both the men and women's draw, with just one seeded player (Elena Rybakina) eliminated. Will Monday yield a bigger surprised?
With Dimers’ biggest tennis betting offering ever—expanded markets, new bet types, and broader sportsbook coverage—and there’s never been a better time to bet on the US Open.
Best Value Bets for Day 9 of the US Open - Monday, September 1
Dimers highlights “High Value” bets when favorable odds line up with strong probability.
Two wagers stand out on on Monday as bets with both High Value and over a 60.0% probability:
Alex de Minaur -7.5 game vs. Leandro Riedi
- Court: Louis Armstrong Stadium
- Time: 11:00 AM ET
- Win Probability: 64.3%
- Edge: 9.8%
- Best Odds: -120 (Caesars Sportsbook)
The 8-seed Australian de Minaur has dropped just one set in the first week of the tournament and looks prime to charge onto the quarterfinals against Riedi who is perhaps on borrowed time having advanced to the R16 via a first-set walkover in the third round.
See our full match predictions for de Minaur-Riedl on Monday, including Moneyline and Game Totals.
Jannik Sinner vs. Alexander Bublik Under 33.5 Games
- Court: Arthur Ashe Stadium
- Time: 7:00 PM ET
- Win Probability: 61.6%
- Edge: 8.2%
- Best Odds: –115 (DraftKings Sportsbook)
Another standout bet with a strong probability and favorable edge according to the Dimers tennis model. To see more bets from this match, view our full match predictions for Sinner vs. Bublik.
To find more value bets, including some moneyline upsets and more, check out Dimers' Best Tennis Bets every day of the US Open.
Betting the US Open Smartly
The opening round is all about balance—taking advantage of sharp value edges while recognizing the volatility of early rounds. Heavy favorites like Jannik SInner and Iga Swiatek look like strong bets to advance, while Dimers’ Day 9 “High Value” picks provide bettors with calculated opportunities. Keep an eye on tight matches like Felix Auger-Aliassime vs. Andrey Rublev, where the win margin is razor thin.
With Flushing Meadows buzzing, the 2025 US Open is primed for drama, and Dimers is giving bettors every tool they need to play it smart.
Responsible Gambling
Remember to please gamble responsibly. If you sense that you're taking your luck too far, know when to call it quits and don't be afraid to seek assistance. Keep in mind that gambling is all about having a fantastic experience! If you or someone you know is grappling with gambling issues, reach out to 1-800-GAMBLER for crisis counseling and support.
To give you the most accurate and helpful information, this article has been reviewed and edited by Nick Slade through our fact-checking process.
Jason Bevilacqua, an expert in MLB, NHL, NBA, MLS, and NFL, delivers game previews, best bets, and props. Since 2020, as Head of Social and Community at Dimers, he has contributed insightful articles utilizing data-driven models and simulations.
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