Sunday, May 31, 2026 lines up as a big DFS slate, with Chicago Cubs vs. St. Louis Cardinals at 7:20 p.m. ET on NBC alongside French Open action—and this Underdog welcome bonus lets you add bonus value quickly. Use the Underdog promo code TOPACTION for Play $5, Get $50 in Bonus Entries, giving you extra entries to spread across MLB and tennis contests.
It’s a straightforward starter boost for new users building picks and lineups in the Underdog app, with bonus entries issued after a $5 play. You must be a new user and 18+ to get started with the sign-up link below.
Underdog Promo Code TOPACTION: Offer Details
The newest Underdog promo code is TOPACTION and unlocks $50 in fantasy bonus entries when you play your $5 first entry. Underdog is a leading DFS platform available in 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.
It’s designed for DFS players who prefer pick’em entries and fast contest builds, not a slow bankroll grind. Cubs vs. Cardinals fits well because you can start small, then use the extra entries to explore multiple angles without needing one perfect card.
The math stays simple: $50 in bonus entries after a $5 play, and it matches a 7:20 p.m. ET first pitch because you can set earlier picks and still leave room to pivot into MLB later. If you’re comparing apps and formats, this Underdog promo code is a solid way to add volume while keeping your initial commitment low.
How to Use Underdog Bonus Entries on Cubs vs. Cardinals
The clean way to stretch your entries across Sunday is to make your $5 play to unlock $50 in Bonus Entries with the Underdog promo code TOPACTION. Then, treat that $50 like a mini budget for multiple builds. Example plan: enter one $20 MLB contest (bonus balance: $30), add two $10 MLB contests (balance: $10), then tack on two $5 French Open contests earlier in the day (balance: $0). You’re covering Cubs-Cardinals at 7:20 p.m. ET on NBC and adding tennis volume without putting more cash in.
Spread the bonus across a full portfolio so one card doesn’t have to do all the work. Run one “safer” entry with a tighter player pool, then pair it with an “upside” entry that leans into correlation and a more contrarian build, and let the bonus entries pay for the extra swings. Copy-and-paste templates:
- MLB-heavy: $20 MLB + $10 MLB + $10 MLB + $5 MLB + $5 MLB
- Tennis-heavy: $20 tennis + $10 tennis + $10 tennis + $5 MLB + $5 MLB
- Balanced: $20 MLB + $10 MLB + $10 MLB + $5 tennis + $5 tennis
One timing note: lock in French Open picks earlier, then finalize Cubs-Cardinals entries closer to contest start so you’re not stuck with late scratches or lineup surprises.
How to Sign Up with Underdog Promo Code TOPACTION
- Tap this Underdog sign-up link to start registration in your state.
- Create your account and enter Underdog bonus code TOPACTION.
- Complete identity verification and log in.
- Deposit at least $10 into your account.
- Enter your first $5 fantasy entry and get $50 in fantasy bonus entries for Cubs vs. Cardinals, the French Open, or any event on the platform.
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).
