Watch: 5 best spinning back fist KOs in UFC history

#2. Paul Felder vs. Danny Castillo

Back in 2015, Paul Felder was an undefeated fighter on a nine-fight win streak. At UFC 182, he earned the knockout of the night despite being placed on the undercard.

The undercard delivered far more excitement than the main card headlined by the first bout between Jon Jones and Daniel Cormier. All but one fight on the undercard ended via knockout, while every fight on the main card was either a decision or no contest.

Against Danny Castillo, Felder met him in the center of the octagon. Castillo fired a kick that started low but whipped itself higher to target his foe's midsection. Felder lifted his leg, partially checking the kick with his knee instead of his shin.

However, with Castillo's kicking leg in the air, he was in a poor position to absorb strikes. Felder turned at the heel, but Castillo quickly retracted his leg back into his stance.

As he threw combinations, hoping to land a left hook as Felder turned away, Felder instead spun, smashing a spinning back fist on his foe's exposed jaw after Castillo had dropped his right hand. It knocked Castill out cold, leaving him on the mat as stiff as a board.

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#1. Zhang Weili vs. Joanna Jędrzejczyk

The first fight between Zhang Weili and Joanna Jędrzejczyk was the Fight of the Year in 2020. So, when their rematch was booked for UFC 275, the excitement surrounding it was palpable.

Zhang had won their first bout by split-decision, with many believing Jędrzejczyk had done enough to claim victory. Thus, by the time of their second outing, Zhang stepped into the octagon with a point to prove.

She exhibited a much-improved wrestling game, securing takedowns against Jędrzejczyk and even controlling her on the ground, both of which every other fighter prior had struggled to do against Poland’s first-ever UFC champion.

When the second round started, Zhang returned to her Sanda background. She threw side kicks to the body, quickly establishing their threat against Jędrzejczyk.

The next time she threw the side kick, Jędrzejczyk darted forward, hoping to catch Zhang's exposed defenses. Instead, as she stepped into range, Zhang countered her with a seismic spinning backfist, knocking Jędrzejczyk out cold.

What made Zhang's knockout win even more impressive was that she managed to do it against a multi-time world champion kickboxer in a rematch against an opponent some claimed had bested her when they first clashed.

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