Viktor Troicki returns to the tennis tour after serving a April 2013 doping suspension . Troicki did n't fail a test but initially refused to take a blood test in one-year . In the end I was totally clean and that 's what hurts me . Formerly the No . 1 in the world , 842nd 's ranking has fallen to Troicki . He went back to school during his time away , studying sports management .
Viktor Troicki returns to the tennis tour after serving a April 2013 doping suspension . Troicki did n't fail a test but initially refused to take a blood test in one-year . Formerly the No . 1 in the world , 842nd 's ranking has fallen to Troicki . He went back to school during his time away , studying sports management .