It turns out that Floyd Mayweather and Conor McGregor didn't have the biggest fight of all time after all. Their boxing match on Aug. 26 reportedly generated 4.4 million pay-per-view buys, falling just shy of the record-setting 4.6 PPVs sold by Mayweather and Manny Pacquiao on May 2, 2015. During the two-month build towards the fight, which included a four-city press tour in the middle of July, there was talk that the undefeated boxer and the UFC star might set a new mark and possibly approach five million buys. Mayweather and McGregor will have to settle for second-best, according to BoxingScene, and an official announcement could come later this week. Finishing at No.2 is an achievement, nonetheless, as the bout sits comfortably ahead of the third-best selling fight in history.

Before his super-fight with Floyd Mayweather, Conor McGregor was the biggest star in the UFC. By making the foray into boxing, McGregor saw his net worth skyrocket. He was guaranteed a paycheck of $30 million, and he could make well more than three times that much when the final pay-per-view numbers and revenues from ticket sales are tallied. According to multiple reports, McGregor could end up raking in more than $100 million from his first-ever boxing match. That's because the PPV is expected to surpass the record set two years ago when the bout between Mayweather and Manny Pacquiao generated 4.6 million buys.

The biggest fight of 2017 and possibly the No.1 pay-per-view of all time is finally almost here. Floyd Mayweather and Conor McGregor will go head-to-head Saturday night at T-Mobile Arena in Las Vegas, pitting the greatest boxer of his generation against the biggest star in UFC history. It all starts at 9 p.m. EDT on Showtime PPV with three undercard bouts preceding the main event. Watching the fight on TV will cost fans $99.99, making for a potential record-setting night. Preliminary bouts are scheduled to start on FOX at 7 p.m. EDT, and those fights can be seen with a free live stream online with FOX Sports GO.

The fight between Floyd Mayweather and Conor McGregor promises to be the biggest bout of 2017, though it won't be cheap to watch. Buying the fight on pay-per-view will cost nearly $100, and no tickets can be had for fewer than $500. The upcoming Aug. 26 bout has been compared to the fight between Mayweather and Manny Pacquiao on May 2, 2015. It generated a record 4.6 million buys, even though it cost $99.95 in HD. Mayweather-McGregor will also cost $99.95,

In the twilight of his boxing career, Manny Pacquiao (59-6-2, 38 KOs) may still have something left to prove. The Filipino icon currently serves in the Senate, but on Saturday he returns to the ring to face Jeff Horn (16-0-1, 11 KOs), an inexperienced Australian who will be fighting in his hometown and in front of 50,000 spectators at Suncorp Stadium in Brisbane. But there is more to this fight than just a legend facing a relatively obscure boxer. The fight will be shown on ESPN, not pay-per-view or HBO, which has mostly been the home to Pacquiao fights over the past 10 years. The fight may also be viewed as a title-fight tune-up for Pacquiao, who at 38 years old may still have something left in him.

The biggest holdup in making the boxing match between Conor McGregor and Floyd Mayweather a reality appears to be money. Both fighters are looking to make nine-figure paydays for what would undoubtedly become one of the highest-selling pay-per-views in history. Mayweather wants a guaranteed paycheck of $100 million to come out of retirement, and there is a precedent for the boxer earning such a large purse. It's how much he was paid to face Manny Pacquiao in 2015, and he eventually made more than twice that amount after receiving a cut of the PPV revenue. McGregor has asked for a $100 million payday, as well, but Mayweather isn't ready to agree to those terms. While McGregor is the UFC's biggest star, he's never had a purse of more than $3 million or even come close to approaching a nine-figure payday when factoring in his cut of the PPV revenue.