Polymarket Promo Code TSN: Trade $10, Get $20 for MLB Predictions (Aug. 13) originally appeared on The Sporting News. Add The Sporting News as a Preferred Source by clicking here.
Take advantage of a lucrative welcome offer using Polymarket promo code TSN and make $10 in trades to win $20 in bonuses. Click here to start the registration process.
This promo provides a significant boost to explore the available markets in MLB and the NFL preseason. This bonus can be applied immediately to participate in any high-stakes MLB contests scheduled throughout the week. Polymarket also has options in politics, culture, crypto and more. Let's take a deeper dive into the details of this offer.
Polymarket Promo Code TSN Unlocks $20 Trading Bonus
| Polymarket Promo Code | TSN |
|---|---|
| New User Offer | Trade $10, get $20 bonus |
| Terms and Conditions | 18+ and Present in the US |
| Bonus Last Verified On | August 13, 2026 |
New Polymarket customers can secure a lucrative $20 trading bonus by using the designated promo code TSN during registration. This special offer is designed to give baseball fans an edge when analyzing the MLB slate, which features premier matchups like the Mariners challenging the Yankees, the Red Sox visiting the Blue Jays, and the clash between the Brewers and Dodgers.
To unlock the $20 bonus, new users simply need to complete registration and make $10 in trades. This immediately qualifies the user for the trading bonus, which can then be used to explore various outcome markets. This promotion is exclusively available to new Polymarket customers who are 18 years of age or older and present in an eligible jurisdiction.
Thursday MLB Probabilities
Market prices reflect a straight projection on which team will win the contest outright, making them the most direct form of MLB market engagement. Here is a look at the current market prices and the implied probabilities for selected matchups:
| Matchup | Implied Probability |
|---|---|
| SEA @ NYY | SEA 43% / NYY 58% |
| BOS @ TOR | BOS 60% / TOR 41% |
| MIL @ LAD | MIL 43% / LAD 58% |
There are MLB games all day long and it starts early with the Yankees and Mariners meeting in the Bronx. New York is firmly entrenched in the Wild Card race while the Mariners are on the outside looking in. Meanwhile, the Red Sox are looking to avoid a sweep at the hands of the Blue Jays and a sixth consecutive loss.
As for the National League, two of the best teams in baseball are facing off. The Dodgers will host the Brewers in a pivotal matchup. Milwaukee sends Shane Drohan (3.87 ERA) to the mound to face off against Roki Sasaki (4.54 ERA).
Don't forget to check out the different options in the NFL preseason this week. Almost every team in the league will step onto the field for the first time since the 2025 season.
Activating Polymarket Promo Code TSN for MLB
Ready to participate in the MLB markets? Activating this exclusive offer is simple and can be completed in just a few steps. Follow the guide below to claim your promotional benefits with Polymarket:
- Create and Register: Initiate the sign-up process, providing all standard personal information required to establish your new account.
- Verify Identification: Complete the necessary proof of identification and verification steps as mandated by the platform.
- Enter Promo Code: During the registration or deposit process, enter the promotional code TSN exactly as shown. This step is critical to linking the offer to your account.
- Make $10 in Trades: Place at least $10 in trades on your new Polymarket account.
Once these steps are completed, your promotional offer will be successfully activated and ready for use on MLB markets.