The 29 year-old, who has lost just once in 30 fights, managed to avoid the scorecards by halting his the Spain-based Argentinian late on to regain the belt he last held in 2012.
Elsewhere in Bonn, Germany, former world title challenger Manuel Charr overcame tough American Kevin Johnson to move a step close to another shot at a recognised heavyweight belt in the future.
Lebanon-born Charr, 29, failed in his bid to become the first fighter to stop Johnson in his lengthy career, but did manage to come away with a 98-92 (twice), 97-93 victory on the judges scorecards.
Johnson has now lost four of his last five fights as the 34 year-old delves deeper into the realms of journeyman status. ‘Kingpin’ had previously been tipped as a future world champion before his one-sided loss to Vitali Klitschko in 2009, but is predominantly seen as a stepping stone for up and coming fighters forging their own path to a world title shot.
Charr has won five in a row since suffering his own loss to the elder Klitschko in September 2012.
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