Terence Crawford and Errol Spence Jr made weight for their undisputed welterweight contest in front of a raucous crowd in Las Vegas on Friday.
Unified champion Spence was 10st 7lbs while WBO belt holder Crawford was slightly lighter by 3oz.
A final face-off passed without incident, with the rivals sharing a few words before a cordial handshake.
The winner will become the first undisputed welterweight champion in the four-belt era.
Crawford, 35, is aiming to become a two-weight undisputed champion, the first male fighter to do so in the four-belt era.
Despite temperatures soaring to 44C in the hours before the weigh-in, it didn't deter thousands of fans attending the ceremonial weigh-in at the T-Mobile Arena.
Boxing legends Mike Tyson, Evander Holyfield and Roy Jones Jr were also in attendance.
It was difficult to tell which fighter attracted more fans, with each undefeated champion given a monster reception.
Crawford was the first to emerge, looking at ease as he played up to the crowd and rapped along to his entrance music, Mr Carter by Lil Wayne.
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