- Leon Edwards has never been KO'd.
- Warlley Alves has only been KO'd once but that was after facing Usman.
- Sean Strickland has only been KO'd once but that was after facing Usman.
- Sergio Moraes was only KO'd once before facing Usman, by Brett Cooper in his 6th pro fight.
- Alexander Yakovlev has only been KO'd once, in his MMA debut against Alexander Shlemenko.
- Demian Maia has only been KO'd once, and that was 10 years ago against Nate Marquardt.
- Tyron Woodley has only been KO'd once, and that was also to Nate Marquardt back in 2012.
So that just leaves Emil Meek and Rafael Dos Anjos who had both been KO'd twice before facing Usman, albeit to very different levels of competition. That's his entire UFC career since he submitted Hayder Hassan in the TUF Finale.