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Georges St-Pierre has explained why his crushing defeat to Matt Serra was the "most humiliating" moment of his glittering UFC career.
He avenged both losses to Matt Hughes and Serra, who was a huge underdog when he beat GSP at UFC 69 back in April 2007.
'The Terror' defied the odds and stopped St-Pierre in the first round to cause one of the biggest upsets in UFC history.
And speaking to BT Sports, the former reigning UFC welterweight champion revealed that his loss to Serra was the "most humiliating thing" in his career and made him the fighter he is today.
"There is a saying that nothing can make you weaker than a victory, and it's true," he said.
"That's what happened when I beat Matt Hughes. My loss [against Serra] made me much stronger because I learned from it, but my victory weakened me.
"I was the new face of the UFC, I was young and I was the guy who just beat Matt Hughes.
"Everyone saw in me an aura of invincibility, and I started to believe in it."
The ex-UFC middleweight champion added: "It was the most humiliating thing in my career.
"I felt I let down everybody, even though it turned out to be a positive experience because it made me who I am today, a much better fighter and martial artist."
St-Pierre recaptured the UFC welterweight title in the rematch, finishing Serra in the second round.
He went onto defend his crown nine times before vacating in 2013. He then returned to the sport four years later and beat Michael Bisping to win a UFC championship in a second weight class.
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