2011-12-10 Lamont Peterson w pts 12 Amir Khan, Convention Centre, Washington DC, USA - WBA/IBF
On 10 December at the Fair Stockade, Tepic, Nayarit, Mexico, Johan Perez won the vacant WBA ‘interim’ title when forcing Fernando Castaneda to retire at the end of the fourth round. Perez would lose his title on 21 July 2012 at the Oasis Hotel Complex, Cancun, Mexico, when beaten by Pablo Cesar Cano on a seventh-round technical decision.
Having failed a drugs test that forced a return with Khan to be cancelled shortly before the fight was due to take place, Peterson was eventually stripped of the WBA belt on 10 July 2012. The WBA then made the decision to reinstate Khan as champion, while the IBF decided in early August that Peterson would remain as their champion following a report by an independent physician.