Play $5 Get $50 Bonus on Cubs vs Orioles MLB: Use Underdog Code BTSLINES

Written By John Carlo Villaruel | Published at July 7, 2026
MLB Underdog Promo Code BTSLINES

Popular daily fantasy site Underdog are offering new players a bumper $50 bonus if they sign up using our exclusive BTSLINES promo code and play at least $5 on any upcoming DFS contest. In this short article, we will walk you through the process for claiming this fantastic deal and tell you how to use your bonus funds for this Wednesday’s MLB showdown between the Cubs and Orioles.

Please note: This new player promotion is currently available in 46 US states. The only four ineligible states are MD, NJ, OH and PA.

How to Get Started at Underdog and Claim Our Exclusive Welcome Bonus

To collect this exclusive welcome bonus, you simply need to follow these five steps:

  1. Access the Underdog website via the banners on this page.
  2. You can either hit the Sign Up button on the homepage or download the Underdog mobile app from the Apple App Store or Google Play Store by clicking the appropriate links.
  3. Complete the short registration form and enter our BTSLINES bonus code into the promo code text box.
  4. After completing your registration, go to your account page and deposit at least $5.
  5. Go to the MLB of the Underdog app or website and play at least $5 on any upcoming DFS contest.

As soon as your DFS entry has settled, Underdog will apply a $50 bonus to your account. You can then use your bonus funds to enter any Underdog DFS contest.

Cubs vs Orioles: How to Make Your Picks at Underdog

The MLB DFS contests at Underdog require you to create a squad containing between two and eight players. Each player will have a stat projection attached to them, and your task is to predict whether each player’s actual stat line for the game will be higher or lower than their projection. For example, if you are entering a contest for the Cubs-Orioles clash, then Orioles pitcher Shane Baz may have a stat of ‘5.50 Strikeouts’ attached to him. You would then need to predict whether Baz would achieve more or less than that total in the game.

Standard Underdog contests require you to get all of your predictions right in order to win a prize, but if you enter a Flex contest, you can still receive a payout, even if one or two of your predictions are incorrect.