Dave Portnoy was left fuming after the controversial end to Sunday's showdown between the Denver Broncos and the Las Vegas Raiders. Before the game, Pete Carroll's team was a 7.5-point underdog at home.With just a few seconds left in the game, the Broncos had a 24-14 lead, meaning people who bet on them were close to winning. However, the Raiders managed to score a field goal after a series of questionable plays and decisions, losing the game by seven points (24-17).On X, Dave Portnoy went on a rant, calling this the "worst beat of all time." He then claimed that the game was rigged and Pete Carroll and the Raiders should be investigated by the NFL."That's the worst beat of all time!" Portnoy said. "You have to investigate the Raiders. Ivestigate the Raiders! What are they doing?! What the f**k?!! That's the worst beat of all time. That is cheating. What the f**k. ... This is the worst beat of all time. Pete Carroll should be in f*****g prison. Prison for Pete Carroll. ... The refs, everybody. This is prison!In the fourth quarter, Will Lutz scored a 23-yard field goal for the Broncos, giving them a 24-7 lead. However, backup QB Kenny Pickett found WR Shedrick Jackson with a 25-yard TD pass to minimize the deficit to 24-14.With just over 20 seconds left, the Raiders converted a first down on a third-and-3 play. Kenny Pickett then found Tyler Lockett with a 26-yard pass during a second-and-10 play. However, Broncos safety Brandon Jones received a delay of the game penalty after his tackle on Lockett.This flag stopped the clock with just five seconds to play. Daniel Carlson then converted a 46-yard field goal, which resulted in his team losing by just seven points, which led to Broncos bettors fuming on social media.Sean Payton opens up about the Broncos' Week 14 victory over the RaidersIn the postgame press conference, Sean Payton heaped praise on his team for their performance on Sunday. He also highlighted their main objective of the season and how they have the chance to host the AFC championship game and potentially become a Super Bowl contender."Our team's done a good job of really focusing and playing for each other the next week," Payton said as per Denver Sports. "Putting good work in. And they're well aware of what they're playing for."We're focused on the next game, really. So, we're not. ... I mean everyone goes home and pays attention to who wins and loses, but our focus as a team is Green Bay, the next game."Sean Payton and his team currently lead the AFC West with an 11-2 record and a 10-game winning streak. They next face the Packers on Sunday at 4:25 p.m. ET.