Novak Djokovic edged to a straight-sets win over German lucky loser Mats Moraing on Tuesday in his opener in Belgrade where the world number one is warming up for the French Open. The clay-court Grand Slam starts in Paris on Sunday, and Djokovic opted for extra match practice on home soil this week. The 34-year-old was made to fight by the world number 253, winning 6-2, 7-6 (7/4) in an hour and 40 minutes.

It was Djokovic's first match since losing the Italian Open final to Rafael Nadal nine days ago. Spaniard Nadal will be the favourite to win a 14th French Open crown next month, although Djokovic will be chasing a 19th Grand Slam title to move within one of Nadal and Federer on the all-time men's list. The Serbian star was in strong form in the opening set on Tuesday, but was broken twice by Moraing in the second before clinching the win in a tie-break.