Since the mid-1970s, the tours have kept track of who has become the year-end world No. 1. With Novak Djokovic recently all but cementing his year-end top ranking for the sixth time in his career, thanks to reaching the quarterfinals of Erste Bank Open in Vienna, now is the perfect time to zone in on the history.
In total, almost 30 players have stayed world No. 1 by the end of the year on both the ATP and WTA tours. It's a coveted position that confirms the player as the best of the season. Like Djokovic, Ashleigh Barty is all but confirmed to hold this year's No. 1 ranking for the second year in a row.
See how much you know about the history of No. 1 rankings: