On July 9, 2015 Mosley made a comeback announcement declaring he would fight former rival Ricardo Mayorga (31-8-1, 25 KOs) at a catchweight of 154 pounds on August 29 at The Forum in Los Angeles. On August 14, Don King filed a lawsuit, which stated that Mayorga still had a promotional contract with him dating back to 2009. Mayorga made a return to boxing in 2014. Legal documents showed that Mayorga, upon his return in 2014, signed a Memorandum of Understanding, confirming that his contract with King still stands. The contracted weight was changed to 158 pounds. At the weigh in, Mayorga came in 7.4 pounds heavier than the limit. Mosley also came in overweight. In the end, Mayorga weighed 165.4 pounds with Mosley much lighter at 159.8 pounds. During the face-off, Mosley's girlfriend, who was also helping promote the fight, soaked Mayorga, emptying a water bottle over his head. Mayorga did not react, although later appeared to slap her backside. Mosley immediately erupted, putting his hands on Mayorga's throat. Many outlets, including the WBC claimed it was all staged, to which Mosley's camp called the WBC appalling. The fight went ahead as planned. Mosley won the fight via 6th-round TKO following a body shot, which dropped Mayorga to his knees. The referee began the count, to which Mayorga did not beat. He later complained it was a low blow, but replays showed it was a legal blow. The time of stoppage was 2:59 on round 6.