Head to headpublished at 13:15
Novak Djokovic v Andy Murray (14:00 BST)
These two have met a whopping 33 times - it's a wonder they can stand the sight of each other across the net! Djokovic leads overall 23-10.
The Serb also leads 4-1 on the clay and 7-2 at Grand Slams. And he's won 12 of their last 14 meetings. Gulp.
Is there any good news for Murray? Well, yes actually. The Scot has the bragging rights from their most recent match, a clay-court final in Rome last month which he won 6-3 6-3. That could be massive.