Canelo Alvarez vs. Christian Mbilli appears set to lose a key undercard bout on fight week.

Alvarez is always a big draw atop any pay-per-view card, and his country is even more invested in the 'Mexico vs. The World' promotional concept. Four world title fights at the end of the night gave the event more widespread appeal.

However, the event is in danger of losing one of its championship bouts. Lindolfo Delgado, who is slated to face Arthur Biyarslanov for the vacant IBF super lightweight title on the main card, is not yet in Saudi Arabia and has no plans currently in place to get on-site. The fight is now in danger and "probably not" going to happen, per boxing reporter Dan Rafael.

NEWS: Per source, Lindolfo Delgado, trainer Robert Garcia & the team remain in the US & don't have travel booked for his vacant IBF 140 title fight vs. Artur Biyarslanov next Saturday on #CaneloMbilli card in Riyadh. Biyarslanov is already there. Will the fight happen?…