Former WBA middleweight champ Mariano Carrera returns to action on Saturday in Duesseldorf, Germany and take on Hungarian Janos Petrovic. Carrera won the title last year with an upset stoppage win over Spaniard Javier Castillejo in a fight of the year candidate but was later stripped of the title after a positive doping test. However, he only got a short suspension as it was viewed he hadnīt taken the forbidden stuff deliberately but as part of his medication for asthma. [details]