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Polymarket promo code SPORTSLINE: Get $20 bonus for Royals-Tigers, MLB, 3M Open predictions on Thursday

New Polymarket users can get a $20 bonus Thursday when they deposit $10 and trade on the day's sports action

ByPublished: Jul 23, 2026 4:05PM UTC . 3 min read
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New Polymarket users can trade on baseball and other sports with the latest Polymarket promo code SPORTSLINE, which gives newcomers a $20 trading bonus when they deposit $10 to make trades. Thursday is a light day for sports with just a handful of MLB games and the 3M Open ongoing, but there are still trading opportunities aplenty for both the day's action and upcoming events like this weekend's WNBA all-star game. Click here to get started and claim your $20 bonus after depositing $10+ with the Polymarket promo code SPORTSLINE: 

Visit the Polymarket promo code review page for the terms and conditions of this offer.

How to sign up for the Polymarket referral code SPORTSLINE

You can sign up for this Polymarket offer using the steps listed below. This offer is only available for new users.

  1. Click CLAIM BONUS on this page. Download the Polymarket app.
  2. Create an account and provide all the required information, such as name, email and payment details. Use the code SPORTSLINE to get your bonus.
  3. Make a first deposit by your preferred deposit method and follow the prompts.
  4. New users must deposit at least $10 in contracts for the $20 trading bonus to be applied to their account.

After depositing $10 with the Polymarket promo code, new users will be given a $20 trading bonus: 

Thursday, July 23 trading preview

  • Royals to win or lose by fewer than 1.5 runs (50%)
  • 3M Open trades

The latest game on Thursday's light MLB schedule has the Kansas City Royals visiting the Detroit Tigers at 6:40 p.m. ET. Things have not gone to plan for either team this season as they occupy the last two spots in the AL Central standings and will likely be sellers at the deadline, with the Tigers potentially moving ace Tarik Skubal with the lefty set to hit free agency this winter. For Thursday's game it's Randy Dobnak (0-0, 1.93 ERA) starting for Kansas City vs. Troy Melton (5-1, 1.80) for Detroit. The SportsLine Projection Model, which simulates every game 10,000 times, has Kansas City either winning outright or losing by fewer than 1.5 runs in 56% of its simulations. Polymarket provides contracts on that outcome at 50%, providing some potential value for traders.

The PGA's 3M Open is already underway, but prediction markets like Polymarket provide the opportunity to make live trades as the tournament progresses. Trade on MLB, golf and more with the Polymarket promo code SPORTSLINE:

Responsible Risk Management

Polymarket offers different ways to keep its users safe with risk management tools like trading breaks, a voluntary opt-out feature and funding limits.  

Prediction Markets are regulated by the Commodity Futures Trading Commission (CFTC) - an independent agency of the U.S. federal government.

Event contracts trading involves a risk of substantial loss and is not suitable for all investors. Participation in prediction markets is subject to applicable eligibility requirements. Participation may be restricted or prohibited in certain jurisdictions and participants are responsible for ensuring their participation complies with applicable laws and regulations in their jurisdiction.

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Nick Stellini
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