'Joshua's greatest test'published at 22:27 BST 29 April 2017
Round 6
Richie Woodhall
Former world champion on BBC Radio 5 live at Wembley Stadium
What has Joshua got now?
This is now a real test of a heavyweight champion of the world.

Anthony Joshua stops Wladimir Klitschko in 11th round of epic fight
Briton retains IBF world heavyweight crown and secures WBA belt
Resurgent Joshua knocked Klitschko down twice in 11th round
Joshua down in sixth round after Klitschko right hook
Joshua also put Klitschko down in fifth
Joshua roared on by 90,000 fans at Wembley Stadium
Michael Emons
Round 6
Richie Woodhall
Former world champion on BBC Radio 5 live at Wembley Stadium
What has Joshua got now?
This is now a real test of a heavyweight champion of the world.
Round 6
Steve Bunce
Boxing pundit on BBC Radio 5 live at Wembley Stadium
Staggering that he managed to get up after that.
Anthony Joshua is slumped in the corner like a man who has just finished a marathon.
Round 6
That is the end of the round six. That knockdown in round six saw Joshua stunned by a brutal right hook and with Joshua wobbling, a left put him on the canvas.
The fight continues. Somehow.
This could end at any second....
Round 6
A brutal right hook sends Joshua crumpling to the canvas. How does he get up? Somehow he does, but he is in trouble like never before in his career.
Round 6
Round 6
Into round six. Both men were in trouble at stages in an incredible three minutes of boxing.
Klitschko is cut over the left eye. Will that be important later on?
Steve Bunce
Boxing pundit on BBC Radio 5 live at Wembley Stadium
That is the greatest round of boxing we have had on 5 live!
Klitschko had no right to survive that round. But not only did he survive it, he dominated the last two minutes for it.
Joshua had nothing left at the end of that round!
Round 5
Ronald McIntosh
BBC Radio 5 live boxing commentator at Wembley Stadium
Both men are absolutely spent. They are extracting the very best out of each other. They are so weary. Joshua looks out on his feet.
Round 5
What a round. What a round. What a round. Klitschko is floored, but gets up. He then lands sweetly on Joshua, whose legs wobble and he is dazed. Klitschko sees the finish line, but somehow Joshua, who looked on course for victory, hangs on.
What drama.
Round 5
Ronald McIntosh
BBC Radio 5 live boxing commentator at Wembley Stadium
One punch here could end this either way!
This is a toe to toe slug-fest reminiscent of a Rocky movie!
Round 5
Joshua in trouble now. Incredible.
Round 5
Klitschko fighting back.
Round 5
Klitschko gets up, but Joshua aims to finish him. He lands with lefts and rights. Tough times for Klitschko.
Round 5
Round 5
Joshua attacks. Klitschko cut.
Round 4
A big right landed from Anthony Joshua, but that was Klitschko's best round so far.
"Just breathe and relax, mate," trainer Rob McCracken tells Joshua.
It can't be easy to relax when someone of 17 stone is hitting you in the face, and hitting you hard.
Round 4
Paul Mulligan: Two massive right hands stunned #Joshua, external there. The old man isn't giving in just yet! #joshuaklitschko, external
Round 4
Klitschko doubles up with two right hooks early in the fourth. His best work so far. Were they punches that hurt Joshua?
Round 3
Richie Woodhall
Former world champion on BBC Radio 5 live at Wembley Stadium
Klitschko won the first two rounds but that was definitely a Joshua round.
He has got to watch out for Klitschko's left hook. The movement is still good from Klitschko but there were a few signs Joshua is starting to get on the front foot.