In-form Parker (on the left) is on a six-fight winning streak, while knockout expert Wardley is undefeated in twenty professional fights.
Fabio Wardley vs Joseph Parker
Venue: The O2, the capital Fight Night: Weekend, the 25th of October
Live Updates: Tune in for round-by-round coverage and listen on the BBC Sport website plus digital platforms from 20:30 BST before switching to national radio from 22:00.
Parker registered almost 20lb heavier than his opponent as both heavyweights presented assured figures - even if in contrasting styles - leading up to this weekend's feature bout in the capital.
From New Zealand Joseph Parker is risking his WBO 'interim' belt and chance to challenge for the global championship on the line facing the undefeated Wardley at the O2 Arena.
Undisputed heavyweight champion Usyk has indicated his aim to retain his four belts versus the victor.
"It all comes down to this. It signifies everything," stated a serious but zoned-in Fabio Wardley, 30, at Friday's scale ceremony.
Wardley - who holds the WBA 'interim' belt - weighed in at 110 kg, in line with his recent bouts.
"This is the one before the one. Every effort is completed. Camp is wrapped up. All the hard work is put in. Now for some downtime now. Huge occasion coming up," he added.
Spitalfields Market in the capital's east hosted more than market goods on the weighing platform as the both heavyweights squared up for the ultimate face-off before the main event.
Joseph Parker winked at the lenses and bobbed along to the tunes.
As he flexed his physique, he seemed hefty and strong as he tipped the scales at eighteen stone ten pounds, merely 5lb below than his heaviest ever.
This marks a significant difference from the sixteen stone twelve pound iteration who was defeated his championship to Joshua in 2018.
"We are cautious, we are careful, but I will to match him blow for blow and I will reach him," Parker declared.
I have reached a different level and will dominate him - Parker
Wardley, dressed in an Ipswich top, maintained a focused look, greeted the audience, but seemed focused.
He may be the lighter guy, Fabio Wardley has superb KO strength. He delivered a thrilling recovery facing Huni in the summer, behind on the judges' cards before defeating his opponent in the final round even though being outboxed for most of the fight.
"His opponent, his camp and boxing fans will find out I belong to be at the summit of this heavyweight ranks," Wardley stated.
"Each rival has been the one critics claim will overcome me. Here we are again. His attributes include exceptional pace, swift, highly seasoned. Yet I remain unbeaten to date, and nothing will change in the ring."
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