The Polymarket promo code ACTION gives new users a $20 bonus after their first $10 deposit. Claim this sign-up bonus offer and trade on today's US Open first-round slate.
Today marks the opening day of the final Grand Slam of the season, with the men's and women's singles draws both getting underway in Flushing Meadows. You can trade on tennis prediction markets from any match with your $20 bonus from Polymarket.
Polymarket Promo Code ACTION: $20 Bonus Offer
| Polymarket Promo Code | ACTION |
|---|---|
| New User Offer | Deposit $10, Get $20 Trading Bonus |
| Terms & Conditions | 18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See http://polymarket.us/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated derivatives exchange and clearing organization. Not available in AZ, IL, MA, MD, MI, MT, NV, OH, and WA. |
| Last Verified Date | August 30, 2026 |
The Polymarket promo code ACTION is available only to new users. Just make a $10 deposit, and Polymarket automatically gives you a $20 bonus, letting you trade on US Open first-round action. Those extra bonus funds make Polymarket one of the best prediction market apps for tennis.
Keep reading to find the US Open odds for today's slate and view our breakdown of the marquee matchup on Sunday, August 30.
US Open First Round Matches on Sunday
| Matchup | Moneyline | Probability |
|---|---|---|
| Alcaraz vs. Safiullin | Alcaraz 88¢ | Safiullin 13¢ | Alcaraz 88% | Safiullin 13% |
| Djokovic vs. Navone | Djokovic 91¢ | Navone 10¢ | Djokovic 91% | Navone 10% |
| Sabalenka vs. Osorio | Sabalenka 93¢ | Osorio 8¢ | Sabalenka 93% | Osorio 8% |
| Fils vs. Tsitsipas | Fils 59¢ | Tsitsipas 42¢ | Fils 59% | Tsitsipas 42% |
It's important to understand how Polymarket odds work. Let's say you make a $10 deposit and trade that same amount on Tsitsipas to win at 42¢. If Tsitsipas advances, your $10 buys about 23.81 contracts, worth about $23.81 at settlement. That means a profit of about $13.81 before fees. If your trade doesn't work out, you lose your $10 stake.
A big part of trading the first round of a Grand Slam is figuring out who's actually healthy. Jannik Sinner withdrew before the tournament with a knee injury, handing the No. 1 seed to Alexander Zverev and reshaping the top half of the men's draw. Emma Raducanu is also out injured.
Carlos Alcaraz, meanwhile, arrives as the defending champion but hasn't played a competitive singles match since April because of a right wrist injury. That layoff makes his opener one of the most interesting pricing questions on the board.
Alcaraz vs. Safiullin
It's not often a defending champion opens a major as a question mark, but Alcaraz does exactly that. The Spaniard hasn't competed in nearly five months, and he drew an opponent who has already beaten him: Roman Safiullin took him out in straight sets at the 2023 Paris Masters, their only hard-court meeting. The head-to-head sits at 1-1.
Alcaraz should still be a heavy favorite given the gap in level, but a rusty two-time US Open champion against a player capable of serving him off the court is the kind of spot where the market can overprice a name. Whoever wins lands in a stacked bottom quarter, with Ben Shelton and Arthur Fils both possible quarterfinal opponents.
How to Sign Up Using Polymarket Promo Code ACTION
- Download the app: Install Polymarket on your iPhone or Android device through the official mobile app store.
- Select “I Have a Referral Code”: During registration, enter the Polymarket referral code ACTION to activate the promo.
- Create your account: Register using your Apple or Google credentials.
- Verify your identity: Complete the age and identity verification process by submitting your phone number and personal details.
- Deposit at least $10: Make a qualifying first-time deposit of $10 or more to unlock the $20 bonus credits.
- Start trading: Once funded, you can use your balance on any available market on the platform. Before placing a trade, use an odds converter to compare implied probabilities and identify potential value.
Users in states with no regulated options still qualify here, so check our guide to sportsbooks by state and our breakdown of where sports betting is legal to see how your market compares before you deposit.
18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See http://polymarket.us/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated derivatives exchange and clearing organization. Not available in AZ, IL, MA, MD, MI, MT, NV, and OH.
