James DeGale became European super-middleweight champion as he secured a majority decision against Piotr Wilczewski in Liverpool.
DeGale bounced back from his points defeat by George Groves in May, the first loss of his professional career.
"It's about time, I'm back on top. Hopefully some doors will open," said DeGale, who will seek a Groves rematch.
"I showed some grit and had to dig deep. His [Wilczewski's] record speaks for himself. He's a good seasoned pro."
The British fighter added: "I got caught in the fourth round and then couldn't hear and my legs went a bit after I lost balance. But I got through it.
"I've got a world ranking now - I'm ranked number two in WBO. I've won the British and European titles in 12 fights and the Olympic gold. I want to fight for the world title by the time of the next Olympics."
DeGale wants another shot at British and Commonwealth super-middleweight champion Groves, who defends his title against Paul Smith on 5 November at Wembley.
"The loss against Groves was a blessing in disguise," said DeGale.