#1 Georges St. Pierre (26-2)
You may not find a fighter who puts himself through inhumane levels of training and has gotten the rightful dividends for all the effort as Georges St. Pierre. The Candian sensation's track record speaks for itself. He is a three-time UFC Champion (2-time Welterweight, 1-time Middleweight), has the most successful title defenses (13) and the second longest combined UFC title reign at 2,204 days.
GSP is an athlete of the highest caliber who has black belts in Brazilian Jiu-jitsu, Gaidojitsu, Shidukon and Kyokushin Karate. The former Welterweight Champion is often criticized for being a boring fighter, in other words, a points-based five-round fighter. He has the most wins by decision in UFC history (12) and is noted for his exorbitant cardio. Don't confuse him for a one-dimensional fighter though as GSP may be the most intelligent man to have ever stepped foot inside the Octagon.
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He understands the intricacies of judging and has used them to his advantage in most of his fights. He has the most takedowns in UFC history (90) and knows exactly how it all factors in the final score. If GSP wants you on the ground, you have no option but to oblige. Then again, he ain't no slouch while standing up either.
GSP can stand and bang with the best of them. He has the tendency to find loopholes in one's game and exploit them to to the core. "He can punch against a grappler, kick against a Puncher, and grapple against a kicker" -- GSP's strategy and style perfectly encapsulated by a fight enthusiast. GSP can do it all and principally, does it at the right moment.
His versatility is his biggest asset which was highlighted by GSP's head coach Firas Zahabi on Joe Rogan's podcast. Zahabi stated that GSP never makes the same mistake twice and has a bag of tricks to outsmart his opponents. It makes complete sense as GSP bounced back from the only two losses in his career and beat both Matt Serra and Matt Hughes in title rematches. That's what makes a bonafide legend.
The 37-year-old even returned after a four-year hiatus and won the Middleweight Championship from Michael Bisping. Ring rust? Not in GSP's case. However, he didn't want to hold up the division and vacated the title a month later due to medical complications. Take notes Conor McGregor.
What makes Rush even more special is his clean-cut persona. He is more or less the antithesis of Jon Jones and is what a true professional looks like, both in and out of the Octagon. An immensely likeable and well-informed human being, GSP is a bonafide Champion, legend and role model. The GOAT.