Tonight in Madison Square Gardens, Rocky Fielding makes his first defence of his WBA Super-Middleweight title against the great Mexican fighter Saul ‘Canelo’ Alvarez.

Many boxing observers were very surprised when the fight was announced, and it is fair to say that it is the Liverpudlian’s biggest night in his career to date.

Canelo comes into the bout off the back of beating Gennady ‘GGG’ Golovkin in their rematch after he served a six-month doping ban for Clenbuterol, which he maintains was found in his system because he ate contaminated meat.

Canelo remains a huge draw in the sport with his large Mexican fanbase expected to be cheering him on in New York tonight and has only lost to Floyd Mayweather in 53 bouts to date.

Fielding by contrast has had a less high-profile career, but has also only lost once, to fellow Liverpudlian Callum Smith back in 2015.

He won this version of the Super-Middleweight title after a fantastic win against Tyron Zeuge in Germany back in July.

Johnny Nelson, one of Sky’s main boxing presenters, believes that a Fielding win would be 'the biggest win ever in the history of boxing.'

“Nobody gives him a chance. Probably Rocky is thinking I will try my hardest, but probably won't win. If he pulls this off, it's the biggest upset ever.”

Nelson is no stranger to hyping up fights and outcomes and many shocks have occurred in a boxing ring before.

That said, the task that awaits Fielding tonight is a daunting one.

Carl Froch, a former Super-Middleweight champion himself believes it to be “mission Impossible” for Fielding tonight, and thinks if Rocky can take him the distance, that would be an achievement itself.

Dave Coldwell thinks that Fielding’s size might just give him a chance.

“It’d be a fantastic story if Rocky could do it, Rocky is a big, big man, it might just help him in this fight. Canelo is short at middleweight and even shorter at 168.”

However, Coldwell still believes that if Fielding were to upset the odds, then it would rank as one of the best of all time.

“Without a doubt one of the biggest victories ever, Canelo is a great fighter, look at the names he's beaten, look at his last performance against 'GGG', the man is on fire. It would be one of the biggest upsets ever.”

Fielding himself has acknowledged that ‘no-one gives me a chance’, but his size advantage could be key tonight.

The bookies make ‘Canelo’ a 1/16 shot or bigger and Fielding a rank outsider at 7/1 to pull off a huge upset tonight. He is going to have to enlist the spirit of James ‘Buster’ Douglas famous win against Mike Tyson to do so.