A team building sandbox for Underdog Fantasy NFL Best Ball drafts

The 2025 Underdog Fantasy Best Ball Team Builder is an interactive draft-board fueled by the latest ADP data from on-going Underdog drafts. It is designed for build discovery and experimentation as a pre-draft planning tool and live-draft companion.

Here's how it works:

1. Select your draft slot
Draft Slot Selection

1.1 β€” Choosing a draft slot filters the board to the top stacks reachable from the chosen draft position based on current Underdog ADPs.

Learn more about the data model

Stack Board

1.2 β€” The stacking targets box provides more information on the filtered teams including the reachability status of their most stacked players:

  • Green: Best 2-Player Stack (excl. RBs)
  • Yellow: Limited Reach (ADP conflict)
  • Grey: Out of reach

Teams are default ranked on the projected value of their best reachable 2-Player stack.

2. Customize your targets
Team Tier Filters

2.1 β€” Use the team filters to highlight only the teams you want to target.

For example, planning a build around a Week 17 DAL-WAS game stack from Draft Slot 5.

Position Filters

2.2 β€” Only players on your selected teams will be highlighted on the draft board.

The green highlight indicates your draft position by round

3. Add players to your build
Draft Slot Selection

3.1 β€” Selecting a player opens a team window with ADP, reachability, and point projection detail. You can also Add or Remove the highlighted player from your build here.

Stack Board

3.2 β€” The stacking targets box will update to reflect stacks and correlation in your build as players are added or removed.

  • Rostered players are filled in green
  • Highlighted teams indicate # of players in your build

Points shown represent projected points rostered

4. Open the Build panel for more

4.1 β€” The expandable Build panel shows more detail across 3 tabs:

Roster Tab

All players

Team Stacks Tab

Distribution across teams

Playoffs Tab

Weeks 15–17 correlation

Superflex

The Superflex Team Builder is available here.

ADP Trends

Use the 2025 Underdog Fantasy Best Ball Average Draft Position table to explore the latest ADP trends from on-going Underdog Drafts.

Cheat Sheet

The 2025 Underdog Fantasy Best Ball Stacking Cheat Sheet provides quick reference to league-wide stacking opportunities and late-season correlation based on the latest ADP and Point Projections from on-going Underdog Drafts.

Data Updates

Projection data and ADP are updated twice weeklyβ€”on Tuesdays and Fridaysβ€”to reflect the most current draft trends.

Learn More

Learn more with a deep dive into the data and model behind this site.

Other Best Ball Resources

Here is some further reading on best ball β€” it includes content from other sites for all levels.

Best Ball Team Builder is an independent project. Underdog Fantasy is not affiliated with or endorsing this tool.