Joshua calls boxing a fickle sport after brutal seventh round KO of Helenius at the O2

Former two-time world heavyweight boxing champion Anthony Joshua needed to block out the jeers from the O2 Arena crowd in London to produce a thunderous seventh-round stoppage against Finland’s Robert Helenius on Saturday night.

It was a second win of the year on the Brit’s comeback trail and extended his record to 26 wins - with 23 stoppages - and three defeats.

The win over stand-in fighter Helenius was Joshua's first stoppage win in two and half years. However, it helped sets up a blockbuster fight with American Deontay Wilder in January.

"It's a fickle sport, you've got to be real about this industry and not get caught up. I've done my job tonight," the 2012 Olympic gold medallist told BBC Radio 5 live after the fight.

“I don’t want to say too much. But my back hurts from carrying the heavyweight division.”

Joshua had been set to face fellow British heavyweight Dillian Whyte until his rival had to be pulled from the show last weekend when “adverse analytical findings” were detected in his doping test.

Helenius stepped in as a last-minute opponent, but the pre-match focus was on what next for Joshua.

A slow start to proceedings on Saturday night, with former UFC champion Conor McGregor in the crowd, saw whistles followed by boos in round three and further jeers at the end of round six.

But Joshua was able to provide the crowd with a spectacular finish, unleashing a huge right hand to knock Helenius off his feet after 1 minute, 27 seconds of round seven.

Joshua had returned to his winning ways in April but only after an unconvincing display in a unanimous points victory over Jermaine Franklin.

There was initial concern over Helenius, who remained motionless needed oxygen after the heavy knockdown, he was able to get back up to his feet before the two fighters touched gloves.

Alabama's Wilder, one of the most devastating punchers in heavyweight history. stopped Helenius in under three minutes in October,