Underdog’s 7th Inning Stretch: Everything You Need to Know, Strategies to Win

Dylan Wilkerson Sports Betting Expert

12 minute read

Underdog Fantasy has made a name for itself with best ball formats, and its midseason MLB tournament — the 7th Inning Stretch — is one of the most compelling fantasy baseball contests on the market. With a $10 entry, a $20,000 grand prize, and a four-round bracket structure that plays out across ten weeks of MLB action, it's the kind of tournament that rewards both draft-room skill and lineup construction savvy.

Updated on 6/26/26

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Here's everything you need to know about the format, the schedule, the prize pool including strategies to take down the top spot.

What Is the 7th Inning Stretch?

The 7th Inning Stretch is a best ball tournament run on Underdog Fantasy. It costs $10 per entry (up to 150 entries per player), kicks off with a snake draft before the first game on June 29, 2026, and runs through the first two weeks of September.

It's a guaranteed contest, meaning the prize pool doesn't shrink if the field doesn't fill to capacity. That's a big deal in a midseason tournament, where entry counts can be unpredictable. Be sure to keep an eye, if it does not fill the odds start to turn into your favor.

The total field is 11,040 entries, split across a bracket structure with four elimination rounds.

How the Tournament Works: A Four-Round Bracket

Unlike traditional season-long formats, the 7th Inning Stretch uses a group-advancement model where you're competing not against the entire field, but against a smaller group — and only the top performers move on.

Here's how the bracket breaks down:

Round 1 — MLB Best Ball Weeks 1–4 (June 29 – August 2)

• 11,040 entries split into 920 groups of 12
• Top 2 in each group advance to Round 2
• 1,840 entries move on

Round 2 — MLB Best Ball Weeks 5–6 (August 3 – August 16)

• 1,840 entries split into 184 groups of 10
• Top 2 in each group advance to Round 3
• 368 entries move on

Round 3 — MLB Best Ball Weeks 7–8 (August 17 – August 30)

• 368 entries split into 46 groups of 8
• Top 1 in each group advances to Round 4
• 46 entries move on

Round 4 — MLB Best Ball Weeks 9–10 (August 31 – September 13)

• All 46 finalists compete in a single group
• Top finisher wins $20,000

The bracket tightens dramatically at Round 3 — going from top-2 advancement to top-1 — so the path to the finals demands consistent scoring over eight full weeks before you even get to the championship rounds with it being slightly more difficult to advance past round 3.

The Prize Pool

The payout structure rewards a wide range of finishers, which is part of what makes this tournament attractive at the $10 price point.

In short: if you make Round 4 (top 46), you're guaranteed at least $250. If you survive to Round 3 (top 368), you win $20. Round 2 advancement (top 1,840) gets you your entry fee back.

Roster Construction

The roster is structured as follows:

• 3 Pitchers (P)
• 3 Infielders (IF)
• 3 Outfielders (OF)
• 1 Flex
• 10 Bench spots

That's 20 total roster spots via a snake draft. Because it's best ball, you never set a lineup. Underdog automatically selects your highest-scoring eligible players at each position every week.

Key Rules to Know

No waivers, trades, or substitutions. Once you draft, your roster is locked for the duration of the tournament. If a player gets injured or traded, you live with it — though traded players do continue to accumulate points on their new team.

Postponed/suspended games: Stats from a game before a postponement count. Stats from when it resumes only count if the resumption happens before that round closes.

Ties in advancement rounds are broken by highest individual player score that round, working down the roster until a tiebreaker is found. If still tied, the earlier entrant advances. In the finals, ties result in an even split of combined prize money.

Multiple entries will be placed in separate groups whenever possible, so you won't cannibalize yourself in Round 1.

Strategies for Winning the 7th Inning Stretch

1. Draft for Upside, Not Floor

Best ball formats reward ceiling, not consistency. That means a player who goes off for 40 fantasy points one week is worth more than a player who reliably posts 20. Target volatile, high-ceiling players throughout your roster.

2. Stack Aggressively

Correlated stacks — two or three players from the same lineup — are a proven best ball strategy. When a team has a big offensive night, your stacked players benefit together. Since you're drafting for 10 weeks of MLB action, look for teams with favorable second-half schedules and elite offenses.

3. Prioritize Pitching Early, but Not Too Early

With only three pitcher slots, you need reliable arms — but in best ball, your worst pitching weeks get dropped automatically. Don't overdraft arms in the early rounds. A healthy mix of one ace and depth is usually better than loading up on pitching at the expense of elite bats.

4. Load Up on Bench Depth at Outfield and Infield

Your 10 bench spots are your safety net. The flex spot and deep bench mean that injuries and slumps are survivable — but only if you have quality depth.

5. Think in Rounds, Not Weeks

You only need to beat your group to advance, not the entire field. In Round 1, your goal is simply finishing top 2 out of 12. That's a very achievable bar. Build rosters that are competitive week-over-week rather than spiking in one or two weeks. Consistency across Weeks 1–4 is what wins Round 1 groups.

6. Enter Multiple Lineups With Varied Strategies

With 150 entries allowed, you have room to experiment. Consider entering lineups with different draft strategies. You can build one aggressive stack-heavy build, one pitching-heavy build, one balanced build. Diversifying your approaches across multiple entries gives you more ways to hit on a winning formula.

7. Target Undervalued Mid-Tier Starters in the Draft

In snake drafts, there's a tier break where the elite guys are gone and the field scrambles for safe picks. Value is found on streamers, breakout candidates, and players with elite peripherals who aren't yet household names. The midseason timing of this tournament means you can look at first-half performance data to identify real breakouts.

8. Don't Ignore the Schedule

Each round corresponds to specific MLB weeks. Before your draft, look at which teams have the most favorable matchups during Weeks 1–4 (Round 1 dates) and which teams have the best run through Weeks 9–10 (the championship rounds). A player with a brutal August schedule but a soft September schedule may actually be a great Finals play if you survive that long.

Since scoring is on aggregate, you want hitters that are going to play the most games. By checking rain postponements, you can find the teams who will play more games than the average MLB team. For example, The Yankees, Braves, Cardinals, Rays, and Red Sox all have multiple games that were supposed to be played pre-6/29 that will be moved to post-6/29. This presents more opportunities for hitters to score on aggregate if they play for these teams.

It is also worth knowing which teams have the easiest 2nd-half schedule. For instance, the San Francisco Giants play the Rockies 10 times in this contest. The White Sox have a total of 26 games against the Tigers, Red Sox, Twins, and Astros, presenting an easy schedule. These are all things you need to consider when drafting MLB 7th Inning stretch teams.

The Bottom Line

The 7th Inning Stretch is one of the most well-structured midseason fantasy baseball tournaments available. The $10 buy-in, bracket format, and wide prize distribution make it accessible and fun — but the four-round gauntlet and best ball scoring mean that draft-room strategy genuinely matters.

The teams that win this tournament won't be built on luck alone. They'll be built on aggressive upside-hunting, smart stacking, and roster depth that holds up across ten weeks of baseball.

Entries close before the first game on June 29, 2026. Draft early, draft boldly, and stretch into the finals.

Dylan Wilkerson

Dylan Wilkerson has over 5 years of experience reporting and analyzing the sports betting industry for various sites. His portfolio includes work for SportsHandle and Action Network, in addition to VegasInsider. His favorite sports are the NFL, College Football, The PGA Tour, the LIV Tour, and Cricket. Dylan has a broad and deep understanding of various sports-related topics. More from Dylan Wilkerson