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Polymarket promo code SPORTSLINE: Get $20 bonus for Mariners-Astros, MLB, WNBA betting on Sunday
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Polymarket promo code SPORTSLINE: Get $20 bonus for Mariners-Astros, MLB, WNBA betting on Sunday

  • August 16, 2026

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Polymarket promo code SPORTSLINE: Get $20 bonus for Mariners-Astros, MLB, WNBA betting on Sunday

Content on this page may include affiliate links. If you click and sign up/place a wager, we may receive compensation at no cost to you.

New Polymarket users can get a $20 bonus when they deposit $10 and trade on MLB games and a lot moreHero Image

The latest Polymarket promo code SPORTSLINE gives new users a $20 bonus when they deposit $10 or more. There are 15 MLB games on the Sunday slate, three WNBA matchups, and the culmination of the PGA Tour’s St. Jude Championship. Caitlin Clark and the Fever will visit Angel Reese’s Dream, while Sunday Night Baseball features the Astros hosting the Mariners. Click here to get started and claim your $20 bonus after depositing $10 with the Polymarket promo code SPORTSLINE:

For the terms and conditions of this offer, be sure to check out the Polymarket promo code review page.

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.
  • Mariners vs. Astros more than 7.5 runs (52%)
  • Fever to win vs. Dream (48%)

It’s an AL West showdown on Sunday Night Baseball as the Astros host the Mariners with both teams looking to come out with a series victory. The Astros, who lead the Rangers by two games and Seattle by five in the division, won the opener 10-7 on Friday. Seattle came back with a 10-5 victory on Saturday and sends out Bryan Woo (8-8, 4.15 ERA), who has struggled mightily on the road this season. Houston will counter with Hunter Brown (3-2, 3.68 ERA). The SportsLine Projection Model, which simulates every MLB game 10,000 times, is expecting this pitching matchup to lead to a higher-scoring game. It has the total coming in at more than 7.5 runs in 57.7% of its simulations, a result that’s priced at 52% at Polymarket. 

The Fever and Dream are battling it out just outside the top three in the WNBA standings. Clark and Co. sit fourth and head to Atlanta to take on Reese and the Dream, who are in fifth place, just another half a game back. Clark scored 29 points in a 98-87 victory against Dallas on Friday, Indiana’s eighth in its past 10 games. Rhyne Howard had 29 in Atlanta’s 104-69 thrashing of the Sun on Thursday, and Reese had 16 rebounds, her third straight game with at least 14. The Dream are also 8-2 in their past 10. Most outlets are giving Indiana about a 51% chance to prevail, and a Fever win is listed at 48% on Polymarket. Trade on the MLB, WNBA 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.  

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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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