Heavyweight Anthony Joshua spectacularly knocked out Robert Helenius inside seven rounds at the O2 Arena in London on Saturday.
The 33-year-old Briton ended Helenius' night with a single shot over the top and a huge right cross to the jaw.
Joshua was originally set to renew hostilities with old rival Dillan Whyte at the O2 Arena but the bout got cancelled after Whyte returned an adverse finding in a drug test last week.
Helenius stepped in to take on the former unified champion, just seven days after he recorded a three-round victory over Mika Mielonen in Finland.
The Finn, who was knocked out in the first round by Deontay Wilder, rushed out in the first round to cuff punches at Joshua's guard but the Brit exercised patience for his opening.
This prompted the London crowd to ring out boos around the arena in the third round as they wanted more action from Joshua who refused to throw any dangerous punches.
In response to the crowd frustration, Joshua delivered a fast right hand that sent Helenius tumbling after a double feint followed by a right.
The three-punch combination sent the Finn to the canvas, with referee Victor Loughlin halting the contest.
Joshua was delighted take out Helenius as he left the ring to celebrate before returning to have his hand formally raised by the referee.
The win marked Joshua's first knockout win in two and half years and sets up a potential blockbuster fight with Wilder in January.