Danny Green and Danny Santiago had their final face-to-face showdown at their weigh-in today in preparation for tomorrow night's fight at Challenge Stadium.
Both boxers weighed in under the agreed 84.9kg limit.
Green weighed 84.4kg and the American was surprisingly heavier, though by only 0.1kg.
Green has promised to have a fun night when he signs off in Perth tomorrow night.
The former three-weight champion has his last hometown bout but is still undecided whether to call it quits for good.
That decision will be taken out of his hands if he fails to fulfil his heavy odds-on favouritism with a convincing victory at Challenge Stadium.
But for now Green, whose record is 31 wins (27 KO) and five losses, is determined to enjoy the moment, confident he will dazzle the "Bronx Bomber" with his speed.
"I want to go in there and have fun, I'm going to be smiling when the bell goes, instead of completely shutting off," the 39-year-old said.
"I just want to try to enjoy it. But if I'm smiling don't get the wrong impression that I'm not switched on, because if you've seen the work I've put in, the preparation, it's been pretty intense.
"We don't cut any corners. I think I'm going to surprise him with my speed."
That view was supported by Green's trainer Angelo Hyder at yesterday's press conference.
"If you think back to Danny when he fought Roy Jones Jr … Danny annihilated him. He was 81.5kg for that fight.
"When Danny's talking about (losing) four kilos, that's off his arms and chest. It doesn't sound a lot but if you just pick up a 600ml bottle of water and had to do that (mimicking a jab) you soon see what that extra weight can do to a body."
When the fight was announced, Green said he was using it to gauge how successfully he could drop down to light-heavyweight after two successive stoppage defeats at cruiserweight (90.7kg), and as a way of tempting Anthony Mundine into a rematch.
A second Mundine bout is looking increasingly distant after Mundine's US debut victory earlier this month.
And the Santiago contest - at a catchweight of 84.9kg - is still a good distance from the light-heavy limit of 79.4kg for the fit and lean Green.
"Well and truly this could be my last fight. It could be my last fight," Green said.
"What goes up must come down. Everything's got to come to an end. I'm 39 years old and I don't want to fight past my use-by date.
"Going into this preparation and going off my last performance, I'm not doing that.
"In my last fight, I was a round away from becoming a world champion for the fourth time, from taking the cruiserweight title from Krzysztof Wlodarczyk."