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Bettors had plenty of momentum after favorites dominated Week 1, but Sunday (Sept. 20) tilted back in the sportsbooks’ favor behind a wave of upsets. Several heavily backed teams failed to win or cover the spread.
The biggest wins for Boyd were the Eagles failing to cover (24-20 over the Titans), the Saints winning outright as large underdogs (24-17 over the Ravens), and the Browns topping the Bucs (23-19). For bettors looking to recoup losses, the afternoon slate offered relief, with the 49ers handling the Dolphins (35-13), the Seahawks routing the Cardinals (31-7), and the Cowboys topping the Commanders (37-20).
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Christian Cipollini, senior trading manager at BetMGM, noted that heading into Sunday’s games, sportsbooks needed key underdog covers to offset a strong Week 1 for public bettors. Getting outcomes from the Browns, Saints, Titans, or Dolphins provided much-needed relief to the house.
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“To this point, sportsbook product creation has largely been guided by a trading department’s ability to profitably price and risk-manage certain bet offers,” Lamb says. “AI trading lifts those limitations, while also enabling that existing human expertise to be leveraged more effectively.”
The 2026 tournament demonstrated why Kambi believes this total integration of AI is necessary. Sportsbooks are no longer built primarily around match results and traditional pre-match markets. Bettors increasingly expect to construct wagers around individual players and specific moments within a game.
The number of Bet Builder bets on the 2026 World Cup doubled compared to the 2022 tournament, with the increase particularly pronounced in-play, where seven times as many live Bet Builders were placed. They accounted for 22% of all live bets, compared with just 3% four years earlier.
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At Caesars Sportsbook, seven of eight early afternoon favorites won outright, and six games went Over the total—many hitting the mark by halftime.
Joey Feazel, head of football at Caesars Sportsbook, told Casino.org that favorites, Overs, and anytime touchdown scorers combined to create a bettor-friendly trifecta. Bettors only faced major resistance when the Los Angeles Chargers were upset by the Arizona Cardinals.
However, LSR noted that traditional game outcomes are no longer reliable indicators of bookmaker profitability, largely due to the rapid growth of same-game parlays and player props.
