Anthony Joshua and Dillian Whyte won via knockout but what did we learn at the O2 on Saturday?

Anthony Joshua and Dillian Whyte impressed with knockout victories at the O2 Arena on Saturday night to set up their grudge match.

But what else did we learn from a big night of boxing in London?

Sky Sports have picked out five talking points from an explosive card in the capital.

Who can beat Joshua?

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At this moment, which heavyweights are you certain could defeat the big-punching beast? He may not yet have faced a true world-beater but the ease with which Joshua has dispatched every obstacle in his path suggests he is ready for such a challenge.

The notion that Joshua had only defeated shorter, older opponents who lack his stellar physique was answered in 90 brutal seconds against Cornish. The Scot was taller, undefeated and sporting an athletic frame but met the same uncompromising fate as Joshua's previous, less heralded foes.

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His vicious power is what may always define the Olympic gold medal winner's career, whatever becomes of him, but that is nothing new at elite heavyweight level. What may ultimately separate Joshua is the fast-twitch movements that get him from 'A' to 'B' - the frightening speed with which he closes the distance, gets beyond the guard of his slower opponent, and lands the punches that have made him boxing's must-watch star.

AJ is a student of the sport

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In the past, Joshua has been forced to let off steam by hitting pads backstage after his quick victories but on Saturday night he revealed a different routine after getting his work done inside a round.

Amped up by the bumper London crowd and the rush of knocking out a 14th victim, Joshua pulled an all-nighter by staying up late to watch Floyd Mayweather end his legendary career with a 49th straight win.

The willingness to study the artistry of Mayweather, the master tactician, is another reminder that Joshua is eager to further his own skill-set. The American brings the polar opposite approach to Joshua inside the ropes yet the British heavyweight realises he may one day need to implement some of Mayweather's defensive abilities.

Joshua has spoken regularly of his admiration for iconic heavyweight Wladimir Klitschko yet the dedication to watch Mayweather's late-night masterclass speaks volumes for his willingness to improve.

The Whyte man for the job

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What we've not yet seen from Joshua is how he handles the mental games that come intertwined with the fight game, but come December 12 we will find out when he boxes Whyte in his first true grudge match.

Whyte stopped former world title challenger Brian Minto in three rounds at the O2 to cement the match-up against Joshua, who he defeated when they were amateur up-and-comers. Much has changed since then, but nevertheless the record books will always state that Whyte has beaten Joshua.

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The Brixton slugger has been vocal about their personal animosity, and the duo had to be separated at a skirmish on Friday after the weigh-ins. Whyte's in-ring ability (he is undefeated in 16 fights) speaks for itself but whether he can boil Joshua's blood will raise different questions about the Watford fighter's temperament.

Boxing is cruel… but you have to take advantage

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When John Wayne Hibbert, in years to come, looks back at his Commonwealth light-welterweight championship victory there will no asterisk accompanying his achievement, nor any mention of his opponent's unfortunate injury that crucially determined the fight.

Injuries will always be part of a sport where gloved fists decide the outcome, and Dave Ryan is the latest puncher to fall victim to his own body's limitations. Having dictated large portions of the nine rounds, he sustained a back injury in the 10th round and never recovered.

Hibbert, smelling blood, pounced and those violent instincts ultimately earned him the belt. Having already lost twice to Ryan, Hibbert wasn't about to let his moment go and a shuddering right hand to his stricken opponent finished the fight.

Young prospects mean the future is safe

London witnessed another foot forward in the careers of some promising up-and-comers on Saturday night, providing a small glimpse into the generation beyond the likes of Joshua.

Charlie Edwards, in just his fifth pro outing, won the English flyweight title with a slick, technical win over Louis Norman characterised by some welcome showmanship.

If it's big power that you like, then the bill had plenty of that, too. Ohara Davis, the lightweight, smashed a sixth KO in eight fights by halting Dame Seck in three while Jake Ball, the light-heavyweight, needed less than three minutes to win his pro debut.

The future looks bright.