Monday Night Baseball: Athletics vs Mariners 9:40 PM ET FanDuel Sportsbook Bonus Code Inside

The Seattle Mariners host the Athletics this Monday, April 20, 2026, for a late-night divisional showdown at T-Mobile Park. New customers can jump into the action by claiming the latest FanDuel Sportsbook bonus code offer, which provides $250 in bonus bets if your first $5 wager results in a win. It is a great way to get started with one of the biggest names in sports betting while watching two young rosters battle it out on the diamond.

FanDuel Sportsbook Bonus Code for April 20, 2026

The current promotion at FanDuel Sportsbook is straightforward. When you sign up and make your first deposit of at least $5, you can place a $5 bet on any market for the Athletics vs Mariners game. If that bet wins, you will receive $250 in bonus bets. This offer is available to new users in states where FanDuel Sportsbook operates legally, including AZ, CO, CT, DC, IL, IN, IA, KS, KY, LA, MA, MD, MI, NC, NJ, NY, OH, PA, TN, VT, VA, WV, and WY. While residents in Washington state can access retail betting, the online FanDuel Sportsbook bonus code offer is primarily for the mobile and web platforms in the states mentioned above.

FanDuel Sportsbook Bonus Code Terms and Conditions

Before you place your first bet on the Athletics or Mariners, make sure you understand the rules for this FanDuel Sportsbook bonus code deal:

• Age Requirement: You must be 21 years of age or older.

• Minimum Deposit: A first-time deposit of at least $5 is required.

• Qualifying Wager: You must place a cash bet of $5 or more on any market.

• Winning Requirement: The $250 bonus is only awarded if your initial $5 bet wins.

• Expiration: Bonus bets expire 7 days after they are credited to your account.

• Wagering Requirement: Bonus bets have a 1x playthrough; winnings from bonus bets are paid out in cash, but the bonus stake is not included.

Find more about this promotional offer in our FanDuel Sportsbook review.

Featured Matchup: Athletics vs Mariners

The Athletics travel to Seattle on Monday night with J.T. Ginn expected to take the mound. It has been a rebuilding year for the A's, but they have shown flashes of power early in the 2026 season. They are facing a Mariners team that has relied heavily on their pitching staff, led by Emerson Hancock for this series opener. T-Mobile Park is known for being a pitcher-friendly environment, so we might see a low-scoring affair as the sun goes down in the Pacific Northwest.

This divisional rivalry often brings out the best in both dugouts. The Mariners are looking to climb the AL West standings, while the Athletics are trying to prove they can compete with the heavy hitters in the league. Using the FanDuel Sportsbook bonus code on this game allows fans to engage with every inning of the 9:40 PM ET start.

FanDuel Sportsbook Odds for Athletics vs Mariners

Odds recorded on April 19, 2026, at 10:00 PM ET. Odds are subject to change.

Bet $5 Get $250 If Your Bet Win

Optimal Use of the FanDuel Sportsbook Bonus Code for Athletics vs Mariners

Since the FanDuel Sportsbook bonus code requires your first bet to win to receive the $250, you might want to consider these strategies for Monday's game:

• Look at the Moneyline: Since you only need a win to trigger the bonus, some bettors prefer picking the favorite (Mariners) on the moneyline. While the payout for the $5 bet is smaller, the goal is to secure the $250 in bonus bets.

• Pitching Matchup: Emerson Hancock has been solid at home. If you believe the Mariners' defense will hold the Athletics' bats silent, a bet on the Mariners to win might be a path toward the bonus.

• Alternative Markets: You aren't limited to the final score. You could place your $5 qualifying bet on a player to record a hit or a specific total, provided you feel confident in that outcome winning.

How to Watch Athletics vs Mariners

• Date & Time: Monday, April 20, 2026, at 9:40 PM ET

• Location: T-Mobile Park, Seattle, WA

• TV Channel: NBCS-CA (Athletics), Mariners.TV (Mariners)

• Streaming: Fubo, MLB.TV