title by a unanimous decision. Sturm then lost his title against former champion Javier Castillejo via TKO on 15 July 2006 but won it back from Castillejo in a rematch on 28 April 2007 by a twelve round unanimous decision in Oberhausen, which he earned after defeating Gavin Topp by TKO in the sixth round. Sturm became a three-time world champion after defeating Castillejo in the rematch. He also fought Randy Griffin twice, drawing with him in their first fight and winning their second fight by unanimous decision. On 2 November 2008, Sturm retained his WBA middleweight title via unanimous decision (118-110, 118-110 and 119-109) over Sebastian Sylvester. He improved to 31-2, with one draw, while Sylvester fell to 31-3. On 11 July 2009, he defended his title against Khoren Gevor in Nürburg in 12 rounds. After over a year of inactivity Sturm came back to defend his WBA title against Giovanni Lorenzo, with the winner becoming the WBA "Super" champion. Sturm defeated Lorenzo by a twelve round unanimous decision with the judges giving a comfortable 117-111 twice and 118-111 on the scorecards. After defeating top contenders Matthew Macklin and Sebastian Zbik, Sturm lost his WBA title to Australian Daniel Geale. Geale's IBF title was also on the line. IBF champion In 2013, Sturm became Germany's first four-time world champion by defeating Darren Barker in Stuttgart. Barker was in no condition to continue after suffering a serious hip injury. Barker's IBF title was on the line. One month later the Englishman announced his retirement from boxing. In mid-2014, Sturm lost his title against Sam Soliman via unanimous decision. Soliman won by official scores of 110-118 (twice) and 111–117. Super-middleweight WBA (Super) champion In 2016, Sturm defeated Fedor Chudinov by way decision, becoming a two-weight world champion. Later after the fight, the doping samples that were taken from Sturm before the fight were suddenly challenged, however, the sample documents were not complete, as the location, time of arrival was not documented. Due to this inaccuracy, Sturm was not stripped of his titles. He then relocated to Bosnia and Herzegovina. Doping allegations Sturm broke the silence two months later with a post which he shared via Instagram where he complained about being treated unfairly by the doping investigators. Sturm wrote that he was only informed two months after the first doping sample about the results and that he wasn't told why it