LAS VEGAS -- As he held a cup of Irish whisky in his right hand and adjusted his tailored suit with his left hand, Conor McGregor looked over at Floyd Mayweather and smiled.

One of the greatest boxers of all time and the biggest star in mixed martial arts had returned to the ring an hour after their much-publicized boxing match for a postfight news conference, and McGregor couldn't help but ignore the trash-talking that had become such a driving force behind their unlikely pairing.

"It was good a fight. It was a bit of fun, right?" McGregor said to Mayweather. "It was a bit of fun."

That's exactly what Saturday's fight between Mayweather and McGregor was: fun.

Conor McGregor lost his fight against Floyd Mayweather, but still had something to celebrate: It was an entertaining bout. Ethan Miller/Getty Images

In a sport where massively hyped fights are often massive letdowns, this was what we thought -- or at least hoped -- it could be, given the disparity in boxing experience between the two. McGregor went toe to toe with Mayweather through nine rounds, arguably claiming four early rounds, before becoming fatigued in the 10th when referee Robert Byrd stopped the fight.

When it was over, Mayweather announced his retirement from boxing with a 50-0 record while McGregor plotted his next move, which could include a much-anticipated trilogy match in the UFC against Nate Diaz. As far as crossover promotions go, everyone involved seemed content to move on and call it a "one-and-done" event.

"I don't even want to talk about my other guys in a boxing match," UFC president Dana White said after the fight. "This was built from the bottom up, from the fans to the media and then up to us when we even started remotely considering something like this. It was just a real special event, and a rare event. I'm not looking to do this again."

Punch stats Punches Mayweather McGregor Landed 170 111 Thrown 320 430 Percent 53% 26% -- Courtesy of CompuBox

It makes sense for White to say that. It's in his best interest for McGregor, his biggest star, to return to the Octagon and not think about boxing again. Unfortunately for White, it's going to be nearly impossible for McGregor to do that when the final numbers are tallied and he walks away with $100 million after headlining what could go down as the biggest combat sports event ever, in terms of pay-per-view buys (an estimated 4.7 million) and live gate numbers (an estimated $80 million).

Mayweather-McGregor happened because there was too much money involved for it not to happen, and the truth is there's too much money on the table for other crossover fights not to happen in the future. It's like having a blockbuster summer action film that's a major box office success. It's not going to win any awards, but it's going to make a ton of money, and chances are sequels and copycat films aren't far behind.

Here are five possible crossover fights we could see in the near future after the financial success of Mayweather-McGregor last week:

Mayweather-McGregor II

McGregor said he was fatigued, not hurt, when referee Robert Byrd stopped the fight. John Gurzinski/Getty Images

Yes, Mayweather said he is retired for good, but we've heard him say that before -- more than once. You know what else he said after the fight on Saturday? "If I see an opportunity to make $300 million or $350 million in 36 minutes, why not?" The only way for Mayweather, who turns 41 in February, to make that kind of money one more time is to have a rematch with McGregor.

A rematch would not have been feasible if Mayweather had knocked out McGregor within the first few rounds, as many thought he might. But they actually had an entertaining fight that many thought ended too soon when Byrd stopped it in the 10th round.

If you were scripting a feud with legs, the start of the rivalry couldn't have been laid out any better for a rematch, with the underdog never getting knocked down, and losing thanks to a questionable decision from the referee.

"I really wish he let it go," McGregor said after the fight. "I thought it was close. I get a little wobbly when I'm fatigued, similar to the Diaz II fight. That's exactly what it was: fatigue. That's why I thought the ref could have let it go a little longer. Let me go down. Let the man put me down. Wobbly or fatigued, that's energy, that's not damage. I'm clear-headed. ... Where was the final two rounds? Let me walk back to my corner and compose myself."

McGregor had some success against Mayweather in the first three rounds of the fight. ESPN Stats & Information

McGregor could easily play up that the referee stopped the fight too early and the judges were out to get him when he looked at some questionable scores in the early rounds. He could say he nearly went the distance with Mayweather in his first professional boxing match and now knows what it takes to beat him the second time around.

It likely won't happen, but if it did it, would once again be a top-three event in terms of pay-per-view and live gate figures, and there's no other matchup out there that you can say that about right now.

McGregor vs. Canelo Alvarez or Manny Pacquiao

Manny Pacquiao, right, who lost a decision to Mayweather in 2015, could get a good final payday in a fight with McGregor. Al Bello/Getty Images

There was a time when it looked like Mayweather-McGregor wasn't going to happen, so Bob Arum, the founder and CEO of Top Rank, said McGregor should fight Manny Pacquiao. Oscar De La Hoya, the founder and CEO of Golden Boy Promotions, said McGregor should fight Canelo Alvarez.

They're smart businessmen. They see the gold mine that McGregor is as a boxer, even though he fought his first professional boxing match on Saturday. A fight between McGregor and either Pacquiao or Alvarez would likely do around 2 million pay-per-view buys, making it one of the five biggest pay-per-view events ever. It would represent one last major payday for Pacquiao, who turns 39 in December, before he retires. It would help Alvarez, who just turned 27, not only get a massive payday but also become more of a mainstream star to casual fans.

The promotional tour would likely center on McGregor and White talking trash with Arum or De La Hoya. Both boxing promoters were critical of Mayweather-McGregor and White in particular. White called out Arum and De La Hoya several times leading up to the Mayweather-McGregor fight, and the war of words got ugly at times. McGregor had some choice words for De La Hoya when asked about him after Saturday's fight.

McGregor vs. Paulie Malignaggi

The reason McGregor dominates the top of this list is because he represents over 1 million pay-per-view buys. There's no one currently in boxing or MMA who can essentially guarantee that with just their name on the marquee. Alvarez is close, but he needs a big-name opponent to crack that number. McGregor's last five fights have done over 1.2 million buys.

Malignaggi is a former two-weight world champion, but he's not a pay-per-view fighter. He headlined cards on cable and has been on the undercard of pay-per-view fights, but he's a retired boxer who's turning 37 in November and was 4-4 in his past eight fights before calling it a career earlier this year.

The potential draw here is the beef that developed after McGregor's camp leaked videos and photos of McGregor knocking down Malignaggi and having his way with him during a sparring session. Malignaggi took offense, left camp and called McGregor a variety of derogatory names. Some wondered whether Malignaggi was spying on McGregor on behalf of his friend Mayweather.

It looked like McGregor and Malignaggi were already angling for a future fight during the arrivals for Mayweather-McGregor last week, as the two conveniently got into it in front of the media.

Anthony Joshua vs. Stipe Miocic

A fight between Anthony Joshua, pictured, and Stipe Miocic would pair the two heavyweight champions for boxing and MMA, respectively. Andrew Couldridge/Panoramic/Icon Sportswire

The impact of the success Mayweather-McGregor had is unmistakable. Many boxers and mixed martial artists are now trying to figure out which crossover fight they could possibly book that would land them a big payday and crossover appeal. UFC heavyweight champion Stipe Miocic has already called his shot and publicly challenged Anthony Joshua, the unified heavyweight champion in boxing, on social media.

Miocic has challenged Joshua on Instagram and Twitter and discussed on TMZ why he wants to step into the ring with Joshua.

. @anthonyfjoshua "This guy" is the universally recognized as the baddest man on the planet. You aren't even the baddest man in the UK. - Stipe Miocic (@stipemiocicufc) June 19, 2017

Heavyweight fights aren't what they used to be, but this would be a unique crossover fight because you would be getting the current undisputed heavyweight champions from boxing and MMA in the ring, whereas with many of these other matches one side is either retired or past his prime.

Jon Jones vs. Brock Lesnar

Jon Jones vs. Brock Lesnar at WrestleMania? Why not? ESPN Stats & Information

A fight between UFC light heavyweight champion Jon Jones and former UFC and WWE heavyweight champion Brock Lesnar seemed like it was a lock for 2018 when Jones challenged Lesnar last month after beating Daniel Cormier to win the title. That was, of course, before it was revealed last week that Jones failed a drug test ahead of his fight with Cormier at UFC 214.

If Jones is found guilty of taking steroids and is suspended for two to four years, his dream match with Lesnar won't take place in the Octagon. Not only would Jones' UFC career be in jeopardy, but Lesnar turned 40 last month and has been in just one UFC fight since 2011 and hasn't had a recognized victory in the Octagon in more than seven years.

That doesn't mean the two couldn't get into a WWE ring and potentially headline WrestleMania, but that wouldn't have the same drawing or earning power as a legitimate fight on pay-per-view. Either way, what McGregor was able to do last week with Mayweather has changed the way fighters and promoters view crossover fights.

"Conor McGregor has been a tremendous inspiration to me," Jones said last month after defeating Cormier. "He has shown me, someone who has been in the upper echelon of the sport for many years now, that these huge paydays are possible. I never thought in my time as a champion that I would see fighters making $100 million or whatever he's making in this Mayweather fight. It's been an inspiration that you can do it."

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