Djokovic will lose his world number three ranking to Andy Murray
Home favourite Novak Djokovic clinched his second tour title of the year after a 6-3 7-6 win over Lukasz Kubot in the final of the Serbia Open in Belgrade.
The world number three held his nerve as Pole Kubot served for the second set, returning two difficult drop shots to force the tie-break.
Djokovic sealed the victory when he won the tie-break without dropping a point.
Elsewhere, Spain's Albert Montanes came back strongly to beat James Blake 5-7 7-6 6-0 and win the Estoril Open.
And fourth seed Tomas Berdych collected his first title of the year when he beat Russia's Mikhail Youzhny 6-4 4-6 7-6 in the BMW Open final in Munich.
Djokovic's victory ends a run of three successive losing final appearances after finishing as runner-up in Miami, Monte Carlo and Rome.
The 21-year-old's family brought the tournament to Serbia after purchasing the licence from the former ABM Amro Open in the Netherlands.
"Although this is not one of the biggest tournament I had won, it means the most to me," Djokovic told 7,000 spectators in a makeshift tennis stadium in the Serbian capital.
But despite the tournament win, Djokovic will lose his number three ranking to Andy Murray when the ATP World Tour standings are published on Monday.