Florida's Only Online Sportsbook Needs Milwaukee. Caesars and BetMGM Need Tampa Bay. The Run Differentials Say the Price Is Still Too Kind to the Rays

The Tampa Bay Rays won the American League pennant on Monday night, 7-3 over Cleveland in Game 6 at Tropicana Field. Freddy Peralta threw 5⅓ innings, Junior Caminero and Yandy Díaz hit two-run homers, and the franchise is in the World Series for the third time in 29 seasons. Per the Associated Press, it will be the first Series since 1980 in which neither team has ever won one. Game 1 is Friday in Milwaukee.

By Tuesday morning the books had a price and a problem, and the problem was not the same at every book.

Three books, two rooting interests

DraftKings opened Milwaukee at -155 on Monday night and had moved to -160, with Tampa Bay at +140, by the time ESPN's Doug Greenberg surveyed the market on Tuesday. FanDuel is -172 and +148. Both teams were long shots in March: DraftKings had the Brewers at 35-1, 14th on its board, and the Rays at 80-1, 22nd. A Tampa Bay title would tie the 1991 Twins as the longest preseason underdog to win a World Series, per SportsOddsHistory.

Long shots that win pennants leave liabilities behind, and Greenberg's survey shows how unevenly those liabilities are spread. Caesars needs Tampa Bay. "The Brewers are still a loss for the house overall on the World Series futures," said Eric Biggio, its head of baseball, because late-season money picked Milwaukee as a contrarian title bet. BetMGM is in the same place: a Brewers title is a loss, a Rays title a win.

Hard Rock Bet is the mirror image. "We've seen a significant late surge in World Series money on Milwaukee, but Tampa Bay remains a major liability for us," said its spokesperson, Jon Chapper. The reason is geography. Hard Rock is the only authorised online sportsbook in Florida, and roughly 21.2 percent of its straight World Series tickets from Florida bettors were on the Rays, against about 7.7 percent in the other states where it operates.

That number is worth holding on to. A national book's liability is the country's opinion. A Florida book's liability is Florida's opinion, and Floridians bet on the Rays at nearly three times the rate everyone else did. The same series, the same price, and one company's best result is the home team losing.

What -160 says, and what the runs say

Strip the margin out of the DraftKings price and -160/+140 implies roughly a 59.6 percent chance for Milwaukee. FanDuel's -172/+148 implies about 61.1 percent. Call it 60 percent, three games in five. If you want to check that arithmetic on any two-way line, our hold calculator does the de-vigging.

There are two cheap ways to estimate what the price should be from the regular season, and they disagree with each other more than either disagrees with the market.

The first uses records. Milwaukee went 103-59, the best record in baseball. Tampa Bay went 98-64. Run those winning percentages through the standard log5 head-to-head formula and the Brewers win a single game about 53 percent of the time, which compounds to roughly 57 percent over a best-of-seven with no home-field adjustment.

The second uses runs. Milwaukee scored 832 and allowed 618, a differential of +214. Tampa Bay scored 736 and allowed 650, +86. Feed those into a Pythagorean expectation with the common 1.83 exponent and Milwaukee "should" have won about 102.5 games, almost exactly what it did. Tampa Bay should have won about 90. The Rays beat their run differential by roughly eight wins. Re-run the head-to-head on those numbers and the Brewers win a single game about 58 percent of the time and the series about 67 percent of the time.

The market at 60 percent sits much closer to the record than to the runs. In effect, it believes most of Tampa Bay's eight extra wins.

The case for believing them

The strongest case for the price, and for the Rays, is that a season-long run differential is not the right instrument for a seven-game series in late October. It counts blowouts in May the same as one-run games in September. It counts innings thrown by fifth starters and mop-up relievers who will not appear in this series. A team built around a short, dominant bullpen and a couple of starters who go five innings can lose a lot of runs in games it was never trying to win and still be the team you would least like to play in a close one. The Rays beat an 85-win Cleveland side 4-2 after trailing 2-1, winning three straight, and the clincher was Peralta giving them 5⅓ innings before the bullpen took the last eleven outs.

We take that seriously, and we think it explains some of the gap, not most of it. The research on teams that beat their Pythagorean record is old and consistent: the overperformance mostly does not carry forward, because close-game records are mostly noise. Eight wins is a lot of noise to bet on. And the bullpen argument cuts both ways. We wrote last Friday that Milwaukee's relievers had the win in seven of its eight playoff games, and that nobody knows what a week of rest does to a pen used that way. That doubt still stands. By Friday it will be eight days since Aaron Ashby's nine-out save at Dodger Stadium.

So here is the honest summary. The record says 57 percent, the runs say 67, the market says 60. We think the runs are the better guide over a season and the record the better guide over a week, and that the truth is closer to the middle than the market's number. A -160 favourite still loses this series about two times in five. Nobody should read a disagreement of a few percentage points as a forecast.

The rest of the board

DraftKings' correct-score market has Brewers in six as the single likeliest result at +360, and the series total of 5.5 games is priced -180 to the over, which says the books expect a long series even with a clear favourite. FanDuel's MVP board is led by William Contreras at +600 and Jackson Chourio at +650, with Caminero the first Ray at +850. Game 1 is Jacob Misiorowski against Drew Rasmussen at 8 p.m. Eastern on Friday, with Milwaukee around -160 and a total of 6 to 6.5, a number that tells you how the market rates both starters. Games 1 and 2 are in Milwaukee, 3 through 5 at Tropicana Field, and 6 and 7, if needed, back at American Family Field on October 30 and 31.

Cleveland's drought is now 78 years. Milwaukee's is the franchise's whole life. Tampa Bay's is too. One of them ends by Halloween, and either way at least one major sportsbook will be glad it did.