Reuters Reuters 28 May, 2021, 6:08 am FILE PHOTO: Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - May 16, 2021 Serbia's Novak Djokovic in action during his final match against Spain's Rafael Nadal REUTERS/Guglielmo Mangiapane BELGRADE (Reuters) – World number one Novak Djokovic will head to the French Open after a patchy start to the claycourt season and aware that he must raise his game if he is to have any chance of securing a 19th Grand Slam title. Having obliterated Daniil Medvedev in the final to clinch the Australian Open in February, Djokovic made a shock last-16 exit at the Monte Carlo Masters against Briton Dan Evans before losing to Russia’s Aslan Karatsev in the Serbia Open semi-finals.