Rafael Nadal will play the ATP Tour Finals for the first time since 2017. (Getty Images)

Set to compete on Monday, Rafael Nadal is readying for his first ATP Tour Finals since 2017. The Spaniard has a lot to prove this time around, as he attempts to join Novak Djokovic, Roger Federer and Jimmy Connors as one of only a handful of players to end the year as world No. 1 five times.

Djokovic is 640 ranking points behind Nadal, who has entered the tournament with an abdominal injury after withdrawing from the semifinals in Paris. 

Though the injury could still sideline the world No. 1, he was seen practicing in preparation for next week.

With only a few days to go until the season-ending tournament, see how much you know about Nadal's history at year-end tournament.