GENEVA: Novak Djokovic overcame soggy conditions on his 38th birthday to beat Matteo Arnaldi on Thursday and reach the Geneva Open semifinals in a tune-up event for Roland Garros. The former world number one retrieved a break in the second set to claim a 6-4, 6-4 win over the 39th-ranked Italian who dumped him out at the first hurdle in Madrid last month. Djokovic is hunting the 100th title of his career on the eve of the French Open having not won a tournament since capturing Olympic gold in Paris last August. “It’s great to be in the semifinals again. Last year I played the semifinals.