Sunday’s sports slate offers plenty of action for fans of college basketball, MLB, and the NBA, making it the perfect time to use the Underdog promo code TOPACTION. New users in eligible states — 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, WY — can claim Play $5, Get $50 in bonus entries to build lineups on one of the top DFS sites.
With the March Madness Elite Eight and multiple MLB and NBA matchups on Sunday, there’s no better way to maximize your fantasy plays using the Underdog promo code TOPACTION.
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How to Claim the Underdog Promo Code TOPACTION (Sunday, March 29)
Follow these steps to activate your bonus on Underdog, one of the top DFS sites:
Step 1: Sign Up
- Click the CLAIM BONUS link and go to Underdog.
- Download the app or create your account.
Step 2: Enter the Promo Code
- Tap “Add Promo Code” during registration.
- Type TOPACTION to claim your bonus entries.
Step 3: Activate Your Bonus
- Enter a lineup of $5 or more in fantasy entries to unlock your $50 bonus.
- You can now start building lineups for March Madness, MLB, and NBA games on Sunday.
Claim your Underdog promo code TOPACTIONhere.
Top Picks for Sunday, March 29
March Madness Elite Eight
- UConn vs. Duke (5:05 p.m. ET, CBS)
- Tarris Reed Jr. Less Than 9.5 Rebounds: Reed has shined in the NCAA Tournament with standout double-doubles, including 31 points and 27 rebounds against Furman, but he has struggled to reach 10 rebounds in most of his recent games. With Duke’s strong rebounding and Reed’s foul tendencies, today’s matchup makes another 10-rebound performance unlikely.
MLB
- Guardians vs. Mariners (7:20 p.m. ET, Peacock)
- Cal Raleigh More Than 1.5 Total Bases: Raleigh is a prime candidate for a breakout tonight after a slow 1-for-11 start to the season, as he faces Slade Cecconi, a pitcher who allowed 24 home runs last year and struggles with high barrel rates. Coming off a massive 60-home run campaign in 2025, the "Big Dumper" has the power to clear this line with a single swing against a vulnerable right-handed starter.
NBA
- Knicks vs. Thunder (7:30 p.m. ET, NBC)
- Jalen Brunson More Than 7.5 Assists: Brunson’s scoring has dipped, but he’s distributing at a season-high rate, averaging 9.2 assists per game in March and topping 7.5 in seven of his last 10 contests. With OKC’s tough defense likely to force him into a playmaking role again, he’s poised to continue creating opportunities for teammates.
- Warriors vs. Nuggets (10 p.m. ET, NBC)
- Kristaps Porziņģis More Than 19.5 Points: Kristaps Porzingis has seen his minutes steadily live in the upper-20s as the season has gone along — and his usage rate is above 30% since joining the Warriors. When you put those two factors together, that makes our projection 22.4 points for Porzingis against the Nuggets tonight.
By using the Underdog promo code TOPACTION, you can maximize your entries across the Elite Eight, MLB, and NBA contests. Join thousands of players on one of the top DFS sites and turn your picks into fantasy lineups and bonus entries today.
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; AZ: 1-800-NEXT-STEP (1-800-639-8783) or text NEXT-STEP to 53342; NY: Call the 24/7 HOPEline at 1-877-8-HOPENY or Text HOPENY (467369).
