The  U.S. Open title is coming down to the top two players in the world–Novak Djokovic and Roger Federer. Sunday’s championship match pits the game’s best against each other at this stage of a second major in succession.

Novak Djokovic and Roger Federer will be meeting for the 42nd time in their careers when they battle for the U.S. Open title on Sunday afternoon.

The head-to-head series could not be any closer, to the extent that it may be all tied up again by the time this one ends. Federer holds a 21-20 edge after beating Djokovic 7-6(1), 6-3 in this summer’s Cincinnati final. Djokovic, however, has won three of their five 2015 encounters–including a 7-6(1), 6-7(10), 6-4, 6-3 victory in the Wimbledon championship match. The Serb is 7-6 at his rival’s expense in Grand Slams despite losing four of their first five such showdowns.

Since toppling Djokovic in Cincinnati…