Lock in the Underdog promo code TOPACTION today to claim a $50 welcome bonus and start building Sweet 16 DFS lineups for March Madness. New users can submit a $5 entry and receive $50 in bonus entries. You get your fantasy bonus entries paid out regardless of whether the lineup wins or loses.
Enter the Underdog promo code TOPACTION at signup or use the module below to activate the offer. Once registered, you can jump into DFS contests across multiple sports. That includes the Sweet 16 round in college basketball, as the NCAA Tournament reaches its most competitive stage thus far.
This promotion is available in a wide range of states, including AL, AK, AR, CA, DC, FL, GA, IL, IN, KS, ME, MS, MN, NE, NM, NC, ND, OK, OR, RI, SC, SD, TX, VT, VA, UT, WI, and WY. This wide availability means plenty of new sign-ups can apply the bonus to Sweet 16 predictions.
Underdog Promo Code TOPACTION: Create CBB DFS Lineup for Sweet 16 Games
Use the Underdog promo code TOPACTION to convert a $5 entry into $50 in bonus entries and build your DFS card for the Sweet 16 slate. With a tighter pool of games, this is a strong opportunity to focus on high-impact players and sharpen your projections with one of the top DFS sites available today.
Getting started is straightforward—open the Underdog app, select your player props, and choose “Higher” or “Lower” for each pick. A perfect lineup can return up to 120x your entry, offering major upside during this stage of the tournament.
Below is a sample Sweet 16 DFS lineup to help guide your first entry.
- Andrej Stojakovic to get "Higher" than 10.5 points
- Dailyn Swain to get "Higher" than 29.5 points + rebounds + assists
- Cam Boozer to get "Higher" than 10.5 rebounds
For entries with three or more picks, you’ll choose between Standard and Flex formats. Standard entries maximize payout potential but require every pick to hit. Meanwhile, Flex entries provide added protection by allowing one miss with a reduced return.
Register With Underdog and Use Promo Code TOPACTION on March 26
Getting started with Underdog is quick and easy. Follow the steps below to activate the Underdog promo code TOPACTION. Then, fund your account and build your first Sweet 16 DFS lineup:
- Download the Underdog App: Use the Underdog promo code TOPACTION module on this page to install the app.
- Set Up Your Account: Create a username and password to begin registration.
- Enter Your Information: Provide your email, date of birth, and required personal details.
- Apply the Code: Enter the bonus code TOPACTION to unlock the Play $5, Get $50 in bonus entries offer.
- Accept Terms & Verify Age: Agree to the Terms of Use and confirm eligibility (18+ in most states, 19+ in AL/NE, 21+ in MA/AZ).
- Complete Registration: Click “Sign Up” to finalize your account.
- Make a Deposit: Fund your account with $10 or more to begin entering contests.
- Create Your First Entry: Build a Pick’em or fantasy lineup using players from Sweet 16 college basketball games.
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).
