Rafael Nadal and Novak Djokovic to play each other for final time in Riyadh

Rafael Nadal, left, and Novak Djokovic will meet for one final time in Riyadh Andrew Couldridge/PA)

Rafael Nadal will have one final battle with Novak Djokovic when they meet in the Six Kings Slam exhibition event on Saturday.

The Spaniard is retiring after next month’s Davis Cup finals in Malaga, bringing the curtain down on an incredible career.