Looking ahead to Fury's fight with Klitschko, were Lennox Lewis and Frank Bruno undefeated, similar to Fury, when they had their first world title fights?

I believe that Tyson Fury is undefeated going into his world title fight with Wladimir Klitschko. Were Lennox Lewis and Frank Bruno also undefeated when they had their first world title fights? 

Tyson Fury has had 24 fights to date and has won all of them, including elimination bouts against American boxers for the WBC and IBF heavyweight titles.

On October 24, in Dusseldorf, Fury will challenge Wladimir Klitschko for the WBA, IBF and WBO heavyweight titles, which Klitschko has held since beating David Haye in 2011; he first won the WBO title in 2000.

Lennox Lewis was undefeated - with 22 wins - going in to his first world title fight, against Tony Tucker in Las Vegas in May 1993. His victory there confirmed Lewis as the WBC heavyweight champion; he'd been awarded the title six months previously after Riddick Bowe declined to fight him. Lewis's first defeat didn't come till his 26th fight, in September 1994, when he was stopped by Oliver McCall.

Frank Bruno, however, had tasted defeat before his first world title challenge, which he lost to the WBA champion "Terrible Tim" Witherspoon in July 1986. That was Bruno's 30th fight: he'd won 28 of the others, but had been stopped by James "Bonecrusher" Smith at Wembley in May 1984.