It explains why Joshua tipped the scales at almost a stone lighter than he did for his previous fight.
BC-BOX-Joshua-What Next?, 756Joshua pressed for time to secure Wilder unification fightAP Photo SPANNYDD205, NYDD206, NYDD204, XEL135Eds: With AP Photos.
"I don't need to say much". He talked of his undefeated record, his belts, and then delivered this message to the owner of the last remaining title, WBC champion Deontay Wilder: "Wilder!"
Despite missing out on a KO win, Joshua now has the experience of going the championship distance.
"Parker's trainer should have advised him of ways to avoid getting disciplined, that's his job".
But any criticism will seem harsh.
"It has been a big question that was asked after the fight".
"We can do it in London, around Wembley, or Cardiff".
The way in which referee Giuseppe Quartarone refused to let any inside close-quarter work develop proved a frustration to both boxers and Parker said: "We could have worked inside more, we can't change it. I am the man". "But there hasn't been one yet". Hearns went on to dismiss Joshua's original statement that the fight had to take place outside of the U.S.
Joshua celebrates with his father.
'The only way to do that would be in the ring against Anthony Joshua and he should keep those comments to himself'.
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Hearn, chairman and founder of Joshua's promoters Matchroom, told BBC Radio 5 Live's Sportsweek programme: "I think negotiations will start next week". "I don't think Joseph Parker did quite enough to win in [the UK]".
Joshua called out 32-year-old American Deontay Wilder, unbeaten in 40 fights, to come and face him in the United Kingdom.
Wilder added: "I come here for one thing - to knock you out and go back home".
And with all 20 victories coming by knockout, the Brit had been a favourite to end last night's contest early, only to find the sturdy Parker hard to dislodge.
What's your take on Wilder's view?
He said: "Last fight Wilder fought in front of about six or seven thousand".
Wilder aside, who else is there for Joshua?
Fury, who is set to return to action later this year, posted a picture on Instagram shortly after the fight had finished of him holding the same four belts Joshua now holds.
"Joseph Parker stated this would be a war". That's how I see it.
An even a bigger test lies ahead of him against Wilder. It would also generate big interest in the UK. "And that secured me another world title belt", he added.
"I would have liked Joe to throw more punches".