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Polymarket Promo Code TSN: Claim $20 Bonus for Monday MLB Predictions (Aug. 24) originally appeared on The Sporting News .
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If you are looking to build your betting bankroll ahead of today's exciting baseball slate, new customers can take advantage of a lucrative welcome offer by using the Polymarket promo code TSN . When you sign up here and make an initial deposit of at least $10, you will instantly get a $20 bonus.
Whether you are looking to back heavy moneyline favorites today or take a swing on a promising underdog later on, this generous welcome bonus can be used to wager on today's matchups as well as any other MLB game this week.
Deposit $10, Get $20 Bonus with Polymarket Promo Code TSN
Polymarket Promo Code TSN New User Offer $20 Bonus Terms and Conditions 18+ and Present in the US Date Last Verified August 24, 2026
Offer Overview
Available strictly to new Polymarket customers, this promotion delivers a $20 sign-up bonus to help kickstart your sports betting strategy. To successfully unlock the reward, you must be 18+ years of age and physically present in an eligible Polymarket state. Once your profile is verified, your $20 bonus will be unlocked immediately after you have made an initial deposit of at least $10.
With your bonus funds secured, we can dive right into today's compelling MLB slate. Whether you want to back the Boston Red Sox on the road against the Miami Marlins or invest in the Philadelphia Phillies as they travel to face the Seattle Mariners, your bonus provides the perfect opportunity to explore a variety of moneyline markets across the league's non-conference matchups.
MLB Moneylines on August 24th
Matchup Moneyline Probability TB @ DET TB -136 / DET +123 TB 56.24% / DET 43.76% BOS @ MIA BOS -130 / MIA +117 BOS 55.09% / MIA 44.91% PHI @ SEA PHI -114 / SEA -103 PHI 51.22% / SEA 48.78% CHC @ ARI CHC -141 / ARI +121 CHC 56.39% / ARI 43.61%
If you are looking to maximize your returns using a $20 stake on today's moneyline markets, backing the slate's heaviest favorite offers a reliable play. A $20 trade on the Chicago Cubs (-141) would yield a solid $14.18 profit. On the flip side, if we want to chase a bigger payout by taking a swing on the slate's biggest underdog, placing $20 on the Detroit Tigers (+123) would return a nice $24.60 profit if they manage to defend their home turf.
When I am handicapping the CHC @ ARI matchup to see if the Cubs warrant their heavy chalk status, the underlying numbers absolutely back up the betting line. Chicago holds a distinct offensive advantage with a .250 team batting average and a .762 OPS, compared to Arizona's .245 average and .719 OPS.
The Cubs also have the edge on the mound, carrying a collective 4.124 team ERA against the Diamondbacks' 4.187 ERA. Combine those statistical advantages with the momentum of Cubs slugger Pete Crow-Armstrong's historic week at the plate, and it validates Chicago as the most statistically sound bet on the board for us today.
Unlocking this offer is a straightforward process, and we are in this together. Follow these simple steps to claim your sign-up bonus before placing your MLB trades today:
Create an Account: Register for a new account here by providing standard personal information (such as your name, date of birth, and email address).
Verify Your Identity: Provide the required proof of identification to ensure your account is fully verified and secure.
Enter the Promo Code: During the registration process, make sure to enter the Polymarket promo code TSN to attach the offer to your new profile.
Make a Deposit: Fund your account with a first-time deposit of at least $10.
Once your initial deposit clears, your $20 promotional bonus will be activated and ready to use for a nice payday on today's MLB slate.
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