Put the Underdog promo code TOPACTION to work for Boston Celtics vs. Cleveland Cavaliers on Sunday, March 8, 1:00 p.m. ET on ABC. Underdog offers a simple new-user offer just in time for a full Sunday of NBA action: Play $5, Get $75 in Fantasy Bonus Entries.
Sign up as a new user (21+), enter promo code TOPACTION, and play $5 to unlock $75 in Fantasy Bonus Entries. You can use these fantasy bonus entries on more NBA games on Sunday or any sport you prefer.
What is the Underdog Promo Code Offer
This Underdog deal is built for new users who want a low-commitment way to try fantasy picks without tying up a big bankroll. You play $5, and you get $75 in Fantasy Bonus Entries, with Underdog promo code TOPACTION.
Timing matters because bonus entries come with a clock. The sweet spot is when the schedule’s packed and you’ve got multiple slates to choose from, like Celtics-Cavs on Sunday afternoon, so you can spread out your plays instead of forcing one big card. Whether your first entry hits or not, you get extended funds to play for more cash.
How to Use Underdog for Celtics vs. Cavs Predictions
Here’s how I’d play Celtics vs. Cavs (Sunday, March 8, 1:00 p.m. ET on ABC) with a simple, trackable example. If I place a $5 entry, I start by signing up and entering the Underdog promo code TOPACTION. Whatever the outcome of my first entry, I still receive $75 in fantasy bonus entries.
Use your fantasy bonus entries on more NBA action, college basketball, or any sport you prefer.
How to Claim the Underdog Promo Code TOPACTION
It only takes a few minutes to get started before the 1 p.m. ET tip on ABC.
- Head to Underdog with this link and start a new account with your email and phone number.
- On the promo code field, enter Underdog promo code TOPACTION before you finish registration. Double-check it’s applied so your offer tracks correctly.
- Verify your identity and confirm you’re 21+ to unlock deposits and pick'em contests.
- Make your $10 first deposit using your preferred payment method and set your contest or pick’em entry size. Keep your deposit amount aligned with the offer rules so you don’t miss any bonus eligibility.
- Place your $5 first entry on any picks or Celtics vs. Cavs predictions you prefer. You get $75 in fantasy bonus entries to use within Underdog.
Tip: Sign up early to avoid verification delays and to explore the platform ahead of the ABC broadcast.
If you are located in a legal, sports betting state, don't miss out on the best NBA betting promos to stack thousands in bonus value ahead of Celtics vs. Cavs at 1 p.m. ET on ABC.
Terms & Conditions
Must be 18+ (19+ in AL, NE; 19+ in CO for some games; 21+ in AZ, MA, and VA) and present in a state where Underdog Fantasy operates. Terms apply. Offer not valid in MD, MI, NJ, NY, OH, and PA. Concerned with your play? Call 1-800-MY-RESET or 1-800-GAMBLER or visit www.ncpgambling.org. NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369).
