2010-11-27 Juan Manuel Marquez w rsc 9 Michael Katsidis, MGM Grand, Las Vegas, Nevada, USA - WBA/WBO/The Ring
Rios 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.
On 3 December 2011, Rios forfeited the WBA ‘second tier’ title when coming in over the weight for a defence against John Murray at Madison Square Garden, Manhattan, NYC, New York, USA. The fight went ahead, but after Murray was stopped in the 11th round the 'second tier' title remained vacant.
Marquez was stripped of his WBA belt on 5 January 2012 for not meeting a mandatory challenger for more than 18 months, and then forfeited the WBO title on 26 January on moving up a weight division. On that date Burns was handed the WBO title.
At the Mandalay Bay Resort, Las Vegas, Nevada, on 14 April 2012, in a fight billed for the vacant WBA title, Rios outpointed Abril over 12 rounds, but failed to become the new champion when unable to make the weight for the second fight running. Rios had originally been signed up to meet Yuriorkis Gamboa, but when the latter pulled out stating management problems were the reason Abril took his place. Following the contest Abril retained the WBA ‘interim’ title.