On November 21, 2009, Sosa lost his title to Rodel Mayol. In the second round, Sosa was badly hurt by a headbutt from Mayol, sending Sosa to the canvas and causing him to sustain an injury which was later determined to be a triple-fracture. The referee ruled the headbutt as an unintentional foul and deducted a point from Mayol. After the ringside doctor inspected the wound, the referee allowed the fight to continue despite Sosa still being groggy from the injury. When the action resumed, Sosa was dropped and the referee waved it off moments later. Sosa, who required a metal plate to be implanted on his cheekbone due to multiple fractures, filed a protest with the WBC to have the decision changed to a "no contest".