Novak Djokovic claimed his 100th ATP Tour-level singles title with a hard-fought victory over Poland's Hubert Hurkacz in the final of the Geneva Open.

Djokovic fought back from losing the first set and being a break down in the decider to beat Hurkacz 5-7 7-6 (2) 7-6 (2) in a gruelling contest lasting three hours and four minutes.

The Serbian is just the third man in the Open era - after Jimmy Connors and Roger Federer - to win 100 ATP titles.

Djokovic, who turned 38 on Thursday, had not won a title since claiming Olympic gold in Paris last summer and had suffered immediate exits from previous clay court events in Madrid and Monte Carlo.

Another painful defeat looked on the cards when he served two double faults to lose his serve in the opening game of the final set, but Hurkacz played an error-strewn eighth game to allow Djokovic to level at 4-4.

More costly errors from the big-serving Pole then allowed Djokovic to ease through the tie-break and complete the perfect preparation for his bid to win a record-breaking 25th grand slam title in the French Open.