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Polymarket promo code SPORTSLINE: Get $20 bonus for Cubs-Cardinals, Dodgers-Mariners, MLB, WNBA on Tuesday

New Polymarket users can get a $20 bonus on Tuesday after depositing $10 or more to trade

ByPublished: Jul 28, 2026 2:53PM UTC . 4 min read
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Tuesday is jam packed with sports, with a whopping 16 MLB games and five WNBA contests on tap, and fans looking to trade on the day's action should claim the latest Polymarket promo code SPORTSLINE to get a $20 bonus after depositing $10. Every MLB team is in action and the WNBA returns from its All-Star break with a bang, including Caitlin Clark and the Indiana Fever playing on national television. 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: 

Tuesday trading preview

  • Cubs-Cardinals fewer than 8.5 runs scored (47%)
  • Dodgers-Mariners fewer than 9.5 scored (52%)
  • Fever to beat Storm by more than 11.5 points (47%)

The Cubs won Monday's game behind huge nights from infielders Alex Bregman and Nico Hoerner and now look for a second straight win over the rival Cardinals. Colin Rea (7-7, 4.85 ERA) gets the start for the Cubs, and while the Cardinals haven't officially named a starter, Michael McGreevy (4-8, 3.07) should be on turn to pitch. The SportsLine Projection Model, which simulates every game 10,000 times, has fewer than nine runs being scored at a 56.9% rate. Polymarket offers fewer than 8.5 runs at 47%.

The Seattle Mariners head to Chavez Ravine for the start of a three-game series with the Los Angeles Dodgers on Tuesday. Veteran Luis Castillo (3-9, 4.85) goes for Seattle while breakout southpaw Justin Wrobleski (11-2, 2.62) goes for the home team. The SportsLine model has fewer than 9.5 runs being scored in 64.6% of its simulations, while Polymarket offers that outcome at 52%.

Caitlin Clark and the Fever return to action with a road trip to the Pacific Northwest to take on the Seattle Storm. Seattle has been the league's worst team and is just 6-23, while Indiana is 17-10. Clark has been nursing a back issue but is listed as probable for Tuesday's game. Given the sheer disparity in quality between the two teams, the Fever winning by at least 12 points should be attainable. They just blew out the 7-20 Connecticut Sun last Wednesday and claimed a 20-point victory over the New York Liberty before that. Trade on Tuesday's MLB and WNBA games 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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