A semifinal showdown between Novak Djokovic and Rafael Nadal was not entirely unexpected when the World Tour Finals draw was revealed. But the script took a twist in making the matchup come to fruition, as Nadal won his group while Djokovic finished second in the other foursome.

Novak Djokovic and Rafael Nadal will be squaring off for the 46th time in their careers when they collide in the World Tour Finals semis on Saturday afternoon.

Interestingly, Djokovic has a chance to level his head-to-head series against both Nadal and Federer this weekend–the latter in a potential title match. The world No. 1 is 22-23 lifetime in his rivalry with Nadal, but the margin has become increasingly closer on a consistent basis. Djokovic has won all three of their meetings in 2015 and seven of their last eight overall. He is 15-6 at Nadal’s expense on hard courts, including 3-2 indoors…