It was always destined to happen, wasn't it?

Sure, Floyd Mayweather Jr. announced his retirement in September 2015. However, few thought it was really the end of his stellar career. With just one more win needed to pass Rocky Marciano's 49-0 record, it seemed inevitable we would see Money in a ring again.

Yes, Manny Pacquiao called it quits after defeating Timothy Bradley Jr. in the third instalment of their trilogy in April of this year, but not many believed he couldn't be tempted to return.

While now a senator in his native Philippines, Pac Man made the inevitable comeback on Saturday, defeating Jessie Vargas on points to become the new WBO champion at welterweight.

Mayweather Jr. just happened to be an interested spectator at ringside.

His presence fuelled speculation of a rematch between two of the sport's modern icons. It didn't just fuel stories actually—it poured a giant can of petrol all over them.

"Not only for myself, but if the fans in boxing want that rematch, then why not?" Pacquiao said, per Lance Pugmire of the Los Angeles Times, in his post-fight press conference.

It was a politically correct response to the line of questioning. But for the fans, Manny? Please. As with most things in life, let alone boxing, money (and, to a degree, Money) will be the deciding factor.

But does anyone really want to see a second fight happen? The first episode was a letdown, although after years of waiting, it would have needed to be something seriously special to live up to all the hype.

Sometimes, however, rematches make sense for more than just financial reasons. Bleacher Report has picked out a selection that would surely be better to watch than Mayweather-Pacquiao 2.

Honourable Mentions

Tyson Fury and Wladimir Klitschko should have fought for a second time by now.

However, injuries and personal problems forced Fury to pull out of two rematch dates. It remains to be seen if the heavyweights ever fight again, but aren't you a little curious to see how a rematch would pan out?

Could Fury bamboozle his rival again? Would Wladimir be able to produce something different to reverse the original outcome? What song would Tyson serenade the crowd with after the final bell?

Hopefully, one day we will find out the answers to all those questions (even the singing one).

Big men Anthony Joshua and Dillian Whyte served up a far better viewing spectacle in December 2015.

Joshua came out on top to even the score with Whyte, who won an amateur bout between the two in 2009, but, for the one and only time in his pro career to date, the former was actually made to work for the victory.

Sam Eggington and Frankie Gavin could do with reheating their domestic rivalry, too. Their Battle of Birmingham in October was arguably the best fight seen in Britain so far this year.

Saul Alvarez against Erislandy Lara was an intriguing contest in 2014. Yes, "intriguing" is the nice way of saying "dull."

Another meeting might appeal to the boxing purists, but—like fans of the original Star Wars movies—the vast majority would rather not have to sit through another episode.

Anyone for Vasyl Lomachenko against Gary Russell Jr. again? What about Keith Thurman and Shawn Porter renewing hostilities at some stage in 2017?

If you've any suggestions, feel free to pop them in the comments section.

Roman Gonzalez vs. Juan Francisco Estrada

According to The Ring magazine, Roman Gonzalez is the best pound-for-pound fighter in the world right now.

His position in the top 10 is open for debate, but you cannot question Chocolatito's achievements. Still only 29, the Nicaraguan has compiled a 46-0 record and is a four-weight world champion.

Gonzalez was last seen beating Carlos Cuadras in September to seize the WBC super flyweight title.

Cuadras said after a brutal 12 rounds, per Bob Velin of USA Today: "[Gonzalez] goes all night long. I felt I did enough to win the fight. I hit him more tonight than he’s ever been hit, and he kept coming. His defense was better than I expected."

A rematch would make a whole lot of sense, yet there's another former opponent who merits the chance for another crack at the 5'3" fighter with the giant reputation.

Juan Francisco Estrada lost out to Gonzalez back in 2012, when the pair were both campaigning at light flyweight.

The Mexican has won eight on the spin since. After holding two world titles at flyweight, he has moved up.

Now campaigning at the 115-pound limit, Estrada and Gonzalez could meet again. All boxing fans should cross their fingers and hope the two are on a collision course.

Francisco Vargas vs. Orlando Salido

Of course Francisco Vargas vs. Orlando Salido had to make this list.

The two super featherweights put on one hell of a show in June of this year. After 12 rounds of non-stop action at the StubHub Center in California, the judges struggled to pick a winner. In fact, two couldn't.

Despite suffering cuts above both eyes, Vargas wound up retaining his WBC title via a majority draw.

It seemed fair neither fighter suffered a loss on his record after leaving absolutely everything in the ring.

Per CompuBox's stats (h/t BoxingScene.com), the duo combined to throw an astonishing 1,593 power punches.

Yet somehow, despite the pair going at each other like Donald Trump and Hillary Clinton during a live presidential debate, the bout finished without a single knockdown.

"It was a draw, but I felt I won," Salido said, per ESPN.com's Dan Rafael. "It was a tough fight, and we fought like Mexicans do."

To go back over old ground is always a risk—how many sequels manage to live up to the first offering?

However, boxing fans deserve to see if Vargas and Salido—who holds a win over Vasyl Lomachenko on his pro record—can produce another fight-of-the-year contender.

Amir Khan vs. Danny Garcia

For the vast majority of the short-lived bout, Amir Khan was in complete control against Danny Garcia in July 2012.

However, everything changed with one counter left hook. Caught on the side of his neck, Khan went crashing to the canvas at the Mandalay Bay Hotel & Casino in Las Vegas.

While he survived through to the end of the third, the Englishman failed to last Round 4. After a third trip to the canvas, referee Kenny Bayless ruled him in no fit state to continue.

It was an avoidable setback for Khan, as Kevin Mitchell pointed out in his report for the Guardian:

[Khan] deserved to lose because he lost his shape in the exchanges and, although he was rocking Garcia almost at will with heavy shots in the first two rounds, cutting him up around the eye, nose and cheek with ripping headshots, with not much of substance coming back at him, he was too easily drawn into a hitting match.

Khan suffered a similar fate in his attempt to beat Saul Alvarez earlier this year. Having impressed in the early stages with his speed and movement, Canelo landed an overhand right to end the contest in Round 6.

Still, the Bolton boxer has no apparent interest in hanging up his gloves just yet.

He is the mandatory challenger for the WBC welterweight title held by, you guessed it, Garcia. The American, however, is scheduled to meet WBA champion Keith Thurman in a unification bout in March 2017.

Come through that tricky test, and a familiar face will be wanting a shot at redemption.

"I'm older and more mature now, and I'm taking the sport more seriously," Khan told Daniel Matthews of MailOnline. "If we fought again, it would be a different story."

Seems there's really only one way to find out...

Chris Eubank Jr. vs. Billy Joe Saunders

The tit-for-tat squabbling between Chris Eubank Jr. and Billy Joe Saunders has become tiresome—the two British middleweights need to settle their feud in the ring.

Their first fight, staged at ExCel Arena, London, back in November 2014, was an absorbing contest that went the distance.

Saunders triumphed by a split-decision verdict, in the process retaining his British, Commonwealth and European titles.

However, Eubank Jr.'s strong finish led many to wonder what might have been had he started in a similarly aggressive manner. In the end, however, he simply left himself with too much ground to make up.

Has either man moved on since that close contest? Not really, no.

Saunders won a world belt in December 2015, outpointing Andy Lee to become the WBO's new champion, but he hasn't been seen since.

The 27-year-old passed up the opportunity to pave the way for a showdown with Saul Alvarez when he rejected a three-man shortlist of opponents to appear on the undercard to Canelo's clash with Liam Smith.

There was talk of a unification bout with Gennady Golovkin, too, yet Saunders' next outing will be against the unknown Artur Akavov. How disappointing.

As for Eubank Jr., he scooped up the British title relinquished by his rival. After two defences, he released a stunning statement to explain why he was relinquishing his grip on the Lonsdale crown.

While they don't want to admit it, this unlikely couple should get back together.

James DeGale vs. George Groves

James DeGale and George Groves may have gone in different directions since their May 2011 clash, but that's not to say their paths won't cross again.

The reason why a second fight makes sense? There's nothing manufactured about their rivalry—they simply do not get along.

The pair both attended the same boxing club—Dale Youth in west London—but were apparently never close. DeGale told Steve Bunce of the Independent: "I never really liked him, and he never really liked me. What's the point of lying?"

Having already won on points when the pair faced each other at the 2007 ABA championships, Groves repeated the trick in the paid ranks four years later.

Since coming out on the wrong end of that majority-decision verdict at the O2 Arena, DeGale has won 13 in a row. He is the reigning IBF champion and faces WBC holder Badou Jack in a unification bout in January 2017.

Saint George, meanwhile, may have failed in three attempts to claim a world title, but he still holds bragging rights over Chunky.

Groves told Sky Sports News HQ: "I said it when we were kids—although not many were listening—and for the last fight, I told a lot of people: I've got his number."

DeGale—the first British fighter to win both an Olympic gold medal and a world title in the pros—would surely like the chance to prove Groves wrong.

If both Englishmen held major belts, a third chapter to their story has to happen, right?