Thai inmate Samson Sor Siriporn boosted her chances of freedom by beating Japan’s Ayaka Miyano to win the vacant women’s WBC light flyweight title at the notorious “Bangkok Hilton” prison. Under the gaze of dozens of prison guards, Siriporn, a convicted drug dealer, battled through the unforgiving Thai heat to score a unanimous victory on points and kick-start parole proceedings for her early release.