4. Floyd Mayweather vs. Conor McGregor
No one really expected this bout to go down, as both men are prone to trash talking and that doesn’t necessarily make fights happen between two different combat sports.
What was all talk became a seminal moment for boxing and MMA. Two of each respective sport’s biggest stars duking it out for all the world to see. And believe it or not, McGregor held his own for the first few rounds, dropping his hands to taunt Mayweather and even getting in a solid shot or two to keep the boxing legend honest.
Ultimately, Mayweather scored a 10th-round TKO in an otherwise thrilling bout between two of the best to ever step in the ring or cage.
Fight fans will probably never see anything like this again, and most of us knew this while watching it. Purists may dismiss it as a cynical cash grab and the repercussions of debuting such a circus are still being felt by MMA, but it really was a special moment and memory for the short lifespan of mixed martial arts.