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Polymarket promo code SPORTSLINE: Get $20 bonus for Rays-Guardians, Mariners-Rangers, MLB on Saturday

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

ByPublished: Jul 25, 2026 8:17PM UTC . 3 min read
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The latest Polymarket promo code SPORTSLINE gives new users a $20 bonus when they deposit $10 or more. An intriguing clash between the Guardians and Rays is one of the top MLB games of the day, along with the WNBA All-Star Game. Click here to sign up and get 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: 

Saturday, July 24 trading preview

  • Rays to win vs. Guardians (52%)
  • Mariners to win vs. Rangers (51%)

Two of the best teams the American League has to offer clash on Saturday with the Rays hosting the Guardians. Tampa Bay dominated the series opener 11-3 on Friday and can lock up a notable series win here on Saturday. The Rays hold first place in the AL East over the Yankees while Cleveland trails the White Sox in the AL Central but hold a wild card spot. Tanner Bibee (4-9, 3.86 ERA) starts for the Guardians while All-Star Nick Martinez (9-2, 2.59 ERA) starts for Tampa Bay. The SportsLine Projection Model, which simulates every MLB game 10,000 times, has the Rays winning in 60% of its simulations, a result that's 52% at Polymarket.

The Mariners entered the year as one of the top World Series contenders, but a poor offense has them trailing the Rangers in the AL West. Seattle visits Texas Saturday night after the Rangers took the series opener on Friday. Bryan Woo (7-6, 4.16 ERA) goes for Seattle against Texas' Nathan Eovaldi (9-8, 4.21 ERA) in this pivotal AL West showdown. The model's top play here is the Mariners winning, which occurs 53% of the time and is trading at 51% at Polymarket. Trade on MLB and more on Saturday 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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Brandon Gustafson
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