Amir Khan was forced to cut short today's media workout after being kept waiting by the late arrival of Zab Judah.
Judah arrived 45 minutes after he was scheduled to start his session in the ring erected close to the casino floor at the Mandalay Bay Resort.
With Khan due to begin himself in just 15 minutes, his business manager Asif Vali informed Golden Boy Promotions' representative that the 24-year-old would not delay his own arrival.
Khan conducted interviews until the controversial Judah - who has a history of trying to unsettle opponents - left the ring, but only had time for some skipping and shadow boxing before departing.
The rivals clash in a light-welterweight unification fight on Saturday night and Judah watched Khan intently as the WBA champion trained.
Around 100 fans attended the event and there was little evidence of any travelling support.
Khan admitted he is wary of IBF belt holder Judah and revealed he has been preparing for the southpaw by sparring Manny Pacquiao.
"Everyone thinks I'm the favourite but I can't go into the fight thinking it will be easy," he said.
"Zab Judah's very dangerous and it will be a hard fight. I'll have to be smart, listen to my trainer Freddie Roach and not make any mistakes.
"I've been sparring with Manny for three years. He has speed, power, great movement and is a southpaw. Sparring him will help me in this fight."
Judah, a five-time world champion and veteran of 49 bouts, stressed the importance of keeping the contest in perspective.
"I can't predict how the fight will end, if I could do that I run over to the bookies and make a couple of million," said Judah.
"I do see myself as the winner of the fight. It will be a sensational win.
"Every day when I wake up I pray for victory and pray for both of us fighters to leave the ring the same way as we went in.
"This is not a death match, it's a boxing fight between two young stars who are trying to fulfil their goals in boxing and move onto the next level."