#4 Shavkat Rakhmonov (15-0)
Shavkat Rakhmonov emerged as a contender in the UFC's welterweight division concurrently with another undefeated phenom, Khamzat Chimaev. Like Chimaev did prior to his recent bout with Gilbert Burns at UFC 273, Rakhmonov holds an undefeated record with 0 decision wins.
The well-rounded skill-set he possesses enabled him to finish every single one of his opponents either by submission or TKO/KO. When he's striking, Rakhmonov prioritizes efficiency and precision.
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He starts every bout from the outside, sitting about a half-inch beyond his opponent's range, which allows him to make reads as he feints to gauge his foes' reactions and analyze their timing while offering him enough time and space to simply hop away from potential strikes without having to retreat a great distance.
This also aids his takedown defense as it causes his opponents to shoot in on his hips from too far out, rendering it much easier for Rakhmonov to stuff double-leg takedowns and hop out of single-leg takedowns.
Once he masters his opponent's timing, he's a devastating force, landing precise strikes informed by his foe's reactions to his feints and movements, finishing opponents without throwing much volume.
#3 Sean Brady (15-0)
Many undefeated fighters in the UFC come from grappling bases. It is a verified method for success because if an opponent cannot keep a fighter off them or prevent a takedown, they risk spending more time on the backfoot, defending instead of attacking.
This is a principle that Sean Brady weaponizes. He does not frequently threaten finishes because he has no need to expose himself to risks if he can reliably win rounds by controlling his foes on the ground.
His Brazilian jiu-jitsu black belt is what allows him to use his positional grappling to neutralize his opponents on the ground. In doing so, Brady has amassed an impressive record of 15 wins and 0 losses, smothering his foes with a determined approach to every fight.