Chris Gutierrez is fresh off the biggest win of his career ... but, he says the moment was actually bittersweet, 'cause he retired UFC legend Frankie Edgar -- someone he admired as a young fan of MMA.
31-year-old Gutierrez, who came into UFC 281 as an unranked fighter, knocked out number 12 ranked bantamweight, 41-year-old Edgar, about halfway through the first round of their contest with a perfectly placed knee. It was the last fight of Frankie's Hall of Fame career.
"It's definitely bittersweet. I knew I still had a job to do, but at the end of the day, I didn't enjoy.