Sportsbooks caught a massive break when No. 9 Iowa knocked out top-seeded Florida on Sunday, ending what had become a punishing run of favourites dominating the opening rounds of March Madness.

The Gators were among the tournament favourites entering the NCAA competition, listed at -550 on the moneyline with an implied probability of 84.62% to beat Iowa. Their shock exit stopped what Caesars Sports Head of Basketball Trading Rich Zanco called “a barrage of favourite bettors and moneyline parlays.”

“Iowa winning was a huge need,” Zanco said. “It saved the day.”

Favourites Run Riot Before Florida Loss

The tournament had been brutal for bookmakers. Favourites winning 20 straight matches at one point across the opening two rounds. Punters piled into moneyline parlays combining multiple favourites, where the spread is irrelevant and teams simply need to win outright.

Friday saw all 16 matches go to the favourites, followed by the first four on Saturday. Bettors who stacked Michigan and Michigan State then rolled their winnings into Duke cleaned up nicely before the Florida result turned the tide.

“The barrage of favourites kept rolling in, and we couldn’t buy an underdog,” Zanco said. “Bettors did extremely well Saturday.”

Six-Figure Wager on Florida Loses

Florida was favoured by as many as 10.5 points on the spread against Iowa, attracting one-way action from punters. Caesars Sports took a significant six-figure bet on Florida -10 shortly before tip-off, only to watch the Gators fall short.

“There were a lot of Florida parlays on the moneyline and the spread,” Zanco added. “Obviously, Iowa winning and knocking Florida out of the championship futures is pretty significant.”

Futures Market Relief

The upset also brought welcome relief in the futures market, where Florida represented a major liability for sportsbooks. SuperBook Vice President John Murray confirmed the Gators were one of his biggest exposures heading into the tournament.

“That’s a great outcome for us. All the moneyline parlay liability was building to Florida and Arizona,” Murray said. “It’s great to get Florida out of the futures book, as well. That was huge for us.”

Murray added he’s hoping to avoid a Final Four scenario with both Florida and Duke still standing. The Blue Devils remain alive after beating TCU 81-58 on Saturday, having narrowly escaped their own upset against No. 16 Siena in the opening round.

With defending champion Florida now out, the remaining No. 1 seeds, Arizona, Michigan and Duke, sit atop the national championship betting boards. March Madness upsets are practically tradition, but this year’s opening rounds had been looking decidedly too conventional for the bookmakers’ liking.

What the team thinks

Philippa Ashworth says:

While the Florida upset certainly provided short-term relief for operators, the broader story here is how mature sportsbook pricing models have become at absorbing exactly this type of variance. The real winners are books that have invested in live betting infrastructure, as these high-profile upsets drive enormous in-play handle that often compensates for pre-match losses while simultaneously boosting customer engagement and lifetime value metrics that matter far more to investors than a single weekend’s hold percentage.