Results from the ATP tournament in Belgrade on Wednesday (x denotes seeding): 2nd rd Novak Djokovic (SRB x1) bt Kwon Soon-woo (KOR) 6-1, 6-3 Miomir Kecmanovic (SRB x8) bt Arthur Rinderknech (FRA) 6-3, 3-6, 6-3 Filip Krajinovic (SRB x5) bt Nikola Milojevic (SRB) 6-1, 6-1 Matteo Berrettini (ITA x2) bt Marco Cecchinato (ITA) 6-4, 6-3 afp