#2. Justin Gaethje – UFC lightweight
Justin Gaethje was known for being a devastating knockout artist long before joining the UFC. The all-action lightweight was a dominant champion in the World Series of Fighting (WSOF) until 2017 when he opted to move over to the world's premier MMA promotion.
Prior to signing with the UFC, Gaethje boasted a perfect 17-0 record, comprising 14 knockouts. In his promotional debut, he delivered as advertised, putting on an absolute barnburner with Michael Johnson that ultimately saw him find the finish.
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After a brief two-fight skid, 'The Highlight' would go on to secure KO/TKO wins over James Vick, Edson Barboza, Donald Cerrone and Tony Ferguson.
Gaethje's fights don't usually go the distance. His 'kill or be killed' mentality has produced some of the most memorable slugfests we've ever seen inside the octagon and he has vowed to never stray from his trademark style. Now in the athletic prime, he will undoubtedly add to his highlight reel in the coming years.
Watch a compilation of Justin Gaethje's finishes below:
#1. Francis Ngannou – UFC heavyweight champion
Francis Ngannou is one of the biggest stars in the UFC, both literally and in terms of superstardom. The reigning heavyweight titleholder's propensity for vicious knockouts has captured the imagination of combat sports fans worldwide.
Ngannou started training at the age of 23, unlike most of his opponents who've been training almost all their lives. His legendary power has proven to be an incredibly effective equalizer throughout his professional career.
In the lead-up to his championship fight against Stipe Miocic in 2018, Dana White shared some unbelievable stats pertaining to the power he possesses.
Ngannou boasts a professional MMA record of 17-3. All but one of his career wins have come by way of finishes, with 12 knockouts and 4 submissions.
His knockout victories over the likes of Andrei Arlovski, Alistair Overeem, Curtis Blaydes, Junior dos Santos, Jairzinho Rozenstruik and Stipe Miocic have ensured that 'The Predator's status as one of the most potent finishers in MMA history is set in stone.
Watch a compilation of Francis Ngannou's finishes below: