Novak Djokovic overcame a slow start and saved a set point before beating Filip Krajinovic 7-6 (8-6) 6-3 in an all-Serbian first-round match at the Erste Bank Open.
Djokovic had an early break for a 3-1 lead but lost the next four games against his regular hitting partner.
However, Krajinovic failed to close out the set as he scored just one point while serving at 5-4 and later missed a set point at 6-5 in the tiebreaker.
Djokovic also took a 3-1 lead in the second but this time saved a break point in the fifth game and wrapped up the win when Krajinovic hit a forehand long and dropped serve for a second time in the set.
Djokovic, who won the event in his last appearance here in 2007, meets Borna Coric in the second round.