#2. Georges St-Pierre is the longest reigning UFC welterweight champion
During his reign as UFC welterweight champion, St-Pierre cemented his legacy as one of the greatest fighters of all-time. He had two welterweight title reigns, but it was his second reign that separated him from the rest. He successfully retained the welterweight title 9-times and the reign lasted a total of 2064 days.
It was a second chance of sorts for 'Rush' as his first title reign didn't last very long. He lost the title to Matt Serra in his first title defense in one of the biggest upsets in UFC history. But the second reign saw him evolve as an MMA fighter as he dominated his opponents.
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GSP never lost the UFC welterweight championship. Instead, he relinquished it after his split-decision win over Johny Hendricks at UFC 167. He took a hiatus from the sport, which lasted 4-years and he returned at middleweight.
#1. St-Pierre has defeated five UFC Hall of Famers
Georges St-Pierre has defeated many legends and former champions throughout his MMA career. In fact, he has victories over 5 UFC Hall of Famers, which is an impressive accomplishment. Aside from his final fight against eventual Hall of Famer Michael Bisping, he competed in the welterweight division.
'Rush's championships were won after defeating a fighter that would eventually be inducted into the UFC Hall of Fame. The Hall of Famers he defeated included Matt Hughes twice, Frank Trigg, Matt Serra, B.J. Penn twice, and Michael Bisping. Not only did he beat them, but most of the wins were decisive.
GSP trails Randy Couture and Rashad Evans, who have beaten 6 Hall of Famers. But in Couture's case, it's important to note that he fought at both heavyweight and light heavyweight throughout his career.