Anthony Joshua knocked out Francis Ngannou in the second round of a stirring victory during Friday’s heavyweight bout in Saudi Arabia.

Joshua, the British star, knocked down Ngannou in the first round, knocked him down again in the second round and then delivered the knockout punch at 2:38 of the second round

The knockout blow, a powerful right hand, left Ngannou out cold. Ngannou, the former UFC champion, was down on the canvas for more than a minute and received oxygen, according to the DAZN broadcast.

The victory was the fourth straight for Joshua (28-3) after his back-to-back losses to Oleksandr Usyk of Ukraine

For me, I don’t know if I’m coming into my peak,’’ he said. “I’m just pushing day by day.’’

it was a stunning setback for Ngannou, who knocked down Tyson Fury during his pro debut in October and looked impressive in a split-decision loss. But Joshua, the two-time world champion, was in control from the outset Friday

Joshua, 34, said he was captivated by Ngannou’s bout with Fury.

Recalled Joshua, “When I saw the fight with him and Fury, I was like, ‘Damn, this guy can fight.’ So I said, ‘I need a piece of that.’ “

But after the fight started Friday, Ngannou, 37, spent almost a much time on the canvas than he did on his feet

He’s a great champion,’’ Joshua said of Ngannou (0-2) after scoring the 25th knockout of his career. “And this doesn’t take away anything from his capabilities. …He can come back

Watch Anthony Joshua knock out Francis Ngannou

Round 1: Ngannou opens with a nice left hook. Fighters measuring the situation. Ngannou looks composed. Big right, mostly blocked by Joshua. … Joshua drops Ngannou with a powerful right! Ngannou back on his feet and beats the eight count. Joshua looks ready to pounce, but time runs out. Joshua 10, Ngannou 8.

Round 2: Ngannou not backing away, but looks a little more tentative. Understandably. Joshua lands hard right. Ngannou throw jabs but nothing connecting. Joshua drops Ngannou again! Another big right! Ngannou back on his feet. And down goes Ngannou again! And he’s down for good

Results for AJ vs. Ngannou full fight card

Click the links to jump to the recap for each fight.

Main card

• Anthony Joshua def. Francis Ngannou, 10 rounds, heavyweight
• Joseph Parker def. Zhilei Zhang, 12 rounds, heavyweight – Zhang’s interim WBO heavyweight title
• Nick Ball vs. Rey Vargas split draw, 12 rounds, featherweight – Vargas’ WBC featherweight title
• Israil Madrimov def. Magomed Kurbanov, 12 rounds, super welterweight – vacant WBA title
• Mark Chamberlain def. Gavin Gwynne, 12 rounds, lightweight
• Justis Huni def. Kevin Lerena, 10 rounds, heavyweight

Preliminary card

• Louis Greene def. Jack McGann, 10 rounds, super welterweight
• Roman Fury def. Martin Svarc, 4 rounds, heavyweight
• Ziyad Almaayouf def. Christian Lopez Flores, 6 rounds, super lightweight
• Andrii Novytskyi def. Juan Torres, 8 rounds, heavyweight