There are injuries, suspensions, and other factors that can prevent a fighter making it to an event. We have seen it documented numerous times.
When that happens, another fighter may jump at the opportunity to take their place for a payday.
And sometimes, fighters may do they unthinkable and cause a shock upset to thrill the crowd.
Notable fighters such as Michael Bisping and Anthony "Showtime" Pettis have won titles as short-notice replacements heading into their fights.
MMA On Point counts down their top 10 short-notice wins in the Ultimate Fighting Championship.