There's been some carnage on UFC 313 fight day, with two matchups falling through on extremely late notice.

The days leading up to Saturday's pay-per-view event at Las Vegas' T-Mobile Arena went smoothly, including no issues on the scale at Friday's weigh-ins.

But as is always the case in mixed martial arts — as 2025 has proven thus far — no bout is good to go until the cage door closes behind both athletes.

That was proven today when the UFC announced two cancellations just a few short hours before its latest numbered event commences in "Sin City."

After John Castañeda was confirmed to be out of his early prelim with Chris Gutierrez, illness also struck a more high-profile matchup, with former interim heavyweight title challenger Curtis Blaydes withdrawing from UFC 313's featured prelim opposite newcomer Rizvan Kuniev.

Tonight's event will move forward with 10 fights, culminating in a light heavyweight title battle between champion Alex Pereira and challenger Magomed Ankalaev.