But it was his response to what motivated him to get fit that surprised the audience.
"I don't want to die," he said.
"I'm in great shape and I trained very hard for this fight and I'm looking forward to this fight," he said.
"I have a lot of respect for my opponent who has come to fight obviously, he's an incredible opponent."
"It's a tall order, he's a big Russian."
Ustinov, through an interpreter, was coy about predicting if he would knock Tua out or when. He said he had enjoyed New Zealand and the support he had got from people here in the past - but that was in kickboxing matches against Australian opponents.
"David has more responsibility and more pressure on him to perform."
The bookmakers at TAB have the two boxers as even for the win with both paying $1.87 for the victory.
Legendary boxing commentator Colonel Bob Sheridan said the undercard was a fantastic one and he was "98 per cent certain" the winner of the Daniel McKinnon and Robbie Berridge fight could have a bout against superstar Roy Jones Jr in New Zealand next year.