2010-11-27 Juan Manuel Marquez w rsc 9 Michael Katsidis, MGM Grand, Las Vegas, Nevada, USA - WBA/WBO/The Ring
2010-11-27 Juan Manuel Marquez w rsc 9 Michael Katsidis, MGM Grand, Las Vegas, Nevada, USA - WBA/WBO/The Ring. Referee: Kenny Bayless. On 26 February 2011, Brandon Rios won the WBA ‘second tier’ title when stopping Miguel Acosta in the tenth round at the Palms Casino Resort, Las Vegas, Nevada. A couple of months later, on 9 April 2011, Robert Guerrero outpointed Michael Katsidis over 12 rounds at the MGM Grand to win the vacant WBA/WBO ‘interim’ titles. Rios then made a further defence of the WBA ‘second tier’ title when stopping Urbano Antillon in the third round of their contest at the Home Depot Centre, Carson, California, USA on 9 July. After the WBA and WBO ‘interim’ titles became vacant at the end of August when Guerrero decided to move up a weight class, Richard Abril outpointed Miguel Acosta over 12 rounds at the Roberto Duran Arena, Panama City, Panama on 22 October to decide the vacant WBA version and Ricky Burns won the WBO crown when he outpointed Katsidis over 12 rounds at The Arena, Wembley, London, England on 5 November.