Former UFC welterweight title challenger Josh Koscheck announces his official retirement from MMA on The Luke Thomas Show on Sirius XM. https:\/\/twitter.com\/MMAonSiriusXM\/status\/1012460505531846656 Koscheck (17-11 MMA, 15-10 UFC) officially hangs his gloves for good on MMA career after 13 years and 28 bouts, including 25 for the UFC. Koscheck last fought in February 2017, where he lost the contest by TKO to Mauricio Alonso at Bellator 172. Josh rose to fame in MMA after appearing on the inaugural season of The Ultimate Fighter (TUF), however in the semifinals he lost a split decision to eventual \u201cTUF 1\u201d champion Diego Sanchez. Josh got the opportunity for a welterweight title shot against Georges St-Pierre back in December 2010 at UFC 124. However, Koscheck lost via unanimous decision. That loss marked Josh's second loss to GSP, who took a unanimous decision in their non-title fight three years earlier at UFC 74. Past few years hasn't been too kind to Koscheck though who has gone 0-6 since 2012. Josh was honest in his assessment of why he's hanging his gloves, as well his inability to compete at a high level showed he 'didn\u2019t have it anymore.' (Via MMAFighting) \u201cYou never know, I might come back some day,\u201d Koscheck said. \u201cThe biggest thing about my mixed martial arts career, at the ending it didn\u2019t go the way I wanted. It\u2019s almost like you kind of just lose it, and it pains me to say that. It really, truly pains me as a fighter because I have a big ego - everybody that steps inside that cage has a big ego - but I truly didn\u2019t have it. I couldn\u2019t go out there and compete with these young guys. I felt great in the gym. I was in great shape. I don\u2019t think I was ever in better shape than I was at 38, 39, and 40, but I just didn\u2019t have it.\u201d Over the course of his MMA career, Josh holds notable wins over the likes of Diego Sanchez, Chris Lytle, Anthony Johnson, Paul Daley, and Matt Hughes.