Sergio Martinez officially retires: “A period in my life ends, thanks to all”

After more than a year of inactivity since losing his RING middleweight title to Miguel Cotto, and plagued by a nagging knee injury, Argentina’s Sergio Martinez officially announced his retirement from the sport of boxing during an emotional speech at the International Boxing Hall of Fame dinner in Canastota, New York, and through a bilingual comment in his official Twitter account.