The first clay ATP Masters 1000 of the season is taking place in Monte-Carlo this week. All eyes will be on defending champion Rafael Nadal, who's trying to gain some rhythm after a hip injury ruined his spring hard-court season. Fans will also be keeping a close eye on Novak Djokovic to see how he handles the start of the clay season after a lackluster 2018 so far.
Test your knowledge of the prestigious tournament: