When you start up a new sportsbook account with the FanDuel promo code, you will have a chance to secure $150 in bonus bets with a winning $5 wager. Bet on MLB games like Astros-Red Sox or Tigers-Phillies for your chance to win the reward.Click here to sign up and claim this offer.The important caveat is that you must win your initial $5 bet to get the $150 in bonus bets. The good news is that new users will have plenty of betting options on Sunday. The aforementioned Astros-Red Sox and Tigers-Phillies games bookend the MLB schedule. Every team will be in action, and a $5 bet on any of them will be eligible to win your $150 in bonus bets.The Wyndham Championship also continues on Sunday, and there will be five WNBA games to bet on: Liberty-Sun, Mystics-Dream, Fever-Storm, Mercury-Sky and Valkyries-Aces.A $5 bet on any of those markets will work the same. As long as your initial bet is at least $5, you will get $150 in bonus bets if that initial wager settles as a win.FanDuel Promo Code Offer For MLB Sunday, MoreAs noted above, you must win your $5 bet to get the $150 in bonus bets. Before you place that first bet, you should look around FanDuel Sportsbook at a wide range of markets to find one that you believe will settle as a winner.For one of Sunday's MLB games, you might want to look into some prop bets. Predicting the winner of a single baseball game is hard, no matter how lopsided the matchup looks on paper. A strikeout prop or hit prop might be the better choice.A winning $5 bet on any market for one of the WNBA games or the Wyndham Championship will also unlock your $150 in bonus bets.Once you find a bet you are comfortable with, place that wager and wait for it to settle to see if you win the reward.FanDuel Sportsbook In-App OffersThe FanDuel Sportsbook app provides new users with plenty of in-app offers to take advantage of in addition to the welcome promo. These offers often include profit boosts for the biggest games of the day.These boosts are typically eligible for parlay wagers. You can take advantage of popular pre-made parlay markets within the FanDuel Sportsbook app or construct your own to get a profit boost with one of the in-app offers.Sign up before Sunday's action starts to maximize your chance at the $150 in bonus bets and claim in-app offers for MLB games, WNBA games and more.Claim FanDuel Promo Code OfferClick here and complete the steps to create your account to redeem your welcome promo. There is no need to enter a code, and you will just have to enter basic personal information (name, date of birth, address, etc.) to confirm your account.The next step is to make a first deposit to cover your initial $5 bet. This can be done with a credit card, debit card or many other secure payment options. The last step is to place your $5 bet and wait for it to settle to see if you win the $150 in bonus bets.If you win the bonuses, use them within seven days before they expire from your account.Newsweek may earn an affiliate commission if you sign up through the links in this article. See the sportsbook operator's terms and conditions for important details. Sports betting operators have no influence over newsroom coverage.