Milwaukee Brewers vs. Tampa Bay Rays | Basewinner MLB Analytics

The 2026 World Series is here, and we're closing out the baseball season with three selections from the Basewinner model.

It's been a long season of analyzing starting pitchers, evaluating lineups, developing park-adjusted offensive ratings, and searching for opportunities where our numbers disagree with the betting market.

This will also be our final Basewinner post for a little while. We're taking a short break from publishing to recharge and spend some time behind the scenes improving our models for next season.

But before we do that, we've got one final World Series card.

We've identified three plays that we believe offer value: Milwaukee to win the series, Over 9.5 total series home runs, and a long-shot player prop involving Tampa Bay's Victor Mesa Jr.

Let's get into the numbers.

Play #1: Milwaukee Brewers to Win the World Series

Selection: Milwaukee Brewers Series Moneyline (-165 at DraftKings)

The Basewinner series model gives Milwaukee a 65.68% probability of winning the World Series, equivalent to fair odds of approximately -191.

At the current DraftKings price of -165, we're getting a better number than our model suggests is fair.

Milwaukee's pitching staff is one of the reasons we're comfortable backing the Brewers.

During the regular season, Milwaukee allowed 171 home runs compared with 201 for Tampa Bay. The Brewers also finished with a 3.51 team ERA, compared with 3.72 for the Rays.

Those numbers alone don't determine the outcome of a seven-game series, but they help illustrate the pitching advantage Milwaukee brings into this matchup.

Our series simulation accounts for the potential outcomes across the matchup and ultimately gives the Brewers approximately a two-in-three chance of winning the championship.

This isn't our largest projected edge on the board, but it's a solid starting point for our World Series card.

Basewinner Selection: Milwaukee Brewers to Win the World Series (-165 at DraftKings)

Play #2: Over 9.5 Total World Series Home Runs

Selection: Over 9.5 Total Series Home Runs (-150 at Caesars Sportsbook)

This is one of my favorite angles on the World Series board, and we've already seen some interesting line movement.

Yesterday, I responded to an X discussion involving Eric Biggio and Caesars Sportsbook about World Series novelty props that they posted. I mentioned that my calculations liked Over 9.5 total home runs at -110, a price available at Caesars.

That number has since moved to -150.

It's always encouraging to identify a potential edge before the market moves, although the line movement itself doesn't guarantee that the wager will win.

What Does the Basewinner Model Say?

Our preliminary Basewinner World Series model projects a 64.86% probability that the two teams combine for at least 10 home runs during the series.

That translates to fair American odds of approximately -185.

We certainly preferred the original -110 price, which offered a substantially larger projected edge. However, our model still shows positive expected value at -150.

Tampa Bay's Pitching Staff Creates an Interesting Matchup

One of the factors supporting our projection is Tampa Bay's home-run prevention rate.

According to the Basewinner Events Database, the Rays allowed 201 home runs during the 2026 regular season across approximately 5,938 opposing plate appearances.

That's a home-run rate of 3.385%, approximately 11.3% above the league baseline used in our matchup calculations.

For comparison, Milwaukee allowed 171 home runs during the regular season.

The Rays finished with a respectable 3.72 ERA despite allowing more home runs than Milwaukee. That creates an interesting matchup against a Brewers lineup featuring Jackson Chourio, Jake Bauers, and William Contreras.

Tampa Bay also brings plenty of power of its own, including Junior Caminero, Jonathan Aranda, Yandy Díaz, and Victor Mesa Jr.

Of course, series length is important. A four-game World Series gives us fewer home-run opportunities than a six- or seven-game series, and individual starting-pitcher matchups will influence the results.

Our 64.86% estimate is a preliminary projection rather than a fully sensitivity-tested probability. Nevertheless, the available data makes this an interesting market.

Basewinner Selection: Over 9.5 Total World Series Home Runs (-150 at Caesars Sportsbook)

Play #3: Victor Mesa Jr. to Hit 2+ Home Runs

Selection: Victor Mesa Jr. 2+ Home Runs (+400 at Heritage Sports)

This might be the most interesting long-shot prop on our World Series card.

One of the statistics I've always paid close attention to in evaluating hitters is isolated power (ISO).

ISO measures a hitter's ability to produce extra bases, removing singles from the equation. It's a useful supporting indicator when evaluating underlying power.

And that's where Victor Mesa Jr. caught my attention.

Mesa Ranks Second in Adjusted ISO on the Betting Board

Using the proprietary Basewinner Park-Adjusted Events Database, we ranked the ten World Series hitters we evaluated on the Heritage Sports home-run prop board.

Here are the top five:

Rankings include the 2026 regular season and postseason through October 22, with a minimum of 150 at-bats.

Despite ranking second in adjusted ISO among these ten players, Mesa is tied for the longest price in the 2+ home runs market at +400.

That's a discrepancy worth investigating.

What Does the Basewinner Database Show?

Mesa's 2026 numbers, including postseason games through October 22:

Mesa's sample size is smaller than that of many established hitters, but his underlying power production has been impressive.

His adjusted ISO provides supporting evidence that his home-run production isn't simply an isolated statistic.

How the Basewinner Home-Run Model Works

Our World Series player home-run model incorporates several factors:

1. Park-adjusted home-run production: We calculate each hitter's adjusted HR/PA using Basewinner's proprietary events database.

2. Statistical regression: We blend the observed rate with the league average to account for sample-size uncertainty.

3. Opposing pitching: We adjust for Milwaukee's home-run prevention rate relative to the league baseline.

4. Expected opportunities: We estimate plate appearances per game using Mesa's recent postseason usage.

5. Series length: We weight the probabilities of four-, five-, six-, and seven-game World Series outcomes.

6. Probability modeling: We use a Poisson model to calculate the chance of at least two home runs across the series.

Park-adjusted ISO is an additional piece of evidence supporting our assessment of Mesa's power; it is not a separate input to the probability calculation.

The Basewinner Projection

Using our original model with a 150-plate-appearance regression prior:

At +400, we need Mesa to hit two or more home runs at least 20% of the time to break even.

Our original model puts him at 23.47%.

Now, I want to be clear about something: Mesa has only 281 plate appearances in our 2026 sample, and regression assumptions matter.

When we use a more conservative 300-PA regression prior, his projected probability drops to 20.7%, which still shows a small positive edge. At 500 PA of regression, the edge disappears.

So this isn't a slam-dunk wager, and the model still expects it to lose more often than it wins.

But when a hitter ranks second in park-adjusted ISO among the players we're evaluating and is tied for the longest odds on the board, it makes sense to me.

That's the kind of potential pricing discrepancy we're constantly searching for at Basewinner.

Basewinner Value Prop: Victor Mesa Jr. 2+ Home Runs (+400 at Heritage Sports)

The Final Basewinner World Series Card

Odds are previously observed prices and may change. The probabilities and expected returns are model estimates, not guarantees.

Final Thoughts — A Short Break for Basewinner

This will be our last Basewinner post for a little while.

I want to thank everyone who has followed along this season, read the analysis, supported the site, or taken an interest in what we're building.

A tremendous amount of time goes into maintaining the Basewinner database, developing the statistical models, evaluating individual matchups, and trying to identify opportunities where our projections differ from the betting market.

Not every projection works out, and there's always more to learn. That's part of what makes this process so interesting to me.

We're going to take a short break from publishing, spend some time refining our models, and work on making Basewinner an even better product for next season.

We're not going anywhere. We're just stepping away from the regular posting schedule for a bit.

If you enjoy independent, data-driven baseball analysis, please consider following Basewinner and sharing our work with other baseball fans. It means a lot and helps us continue building this project.

For now, let's enjoy the World Series and hopefully finish the season on a winning note.

Thanks again for all the support.

Much love…BW

Data sources: Basewinner proprietary Park-Adjusted Events Database (mlb_events.public.adjusted_events), 2026 regular season and postseason through October 22, 2026; Basewinner 2026 regular-season pitching event data. Statistical analysis, park adjustments, and probability projections by Basewinner.

Model estimates depend on playing time, series length, matchup assumptions, and statistical regression. All wagers involve risk. Expected ROI is a mathematical projection, not a guarantee of profit.