ATP World Tours Finals
The Barclays ATP World Tour Finals is a tennis tournament exclusively featuring the top eight male players in the world. It takes place at the end of the year.
The tournament is unique in that it is not a typical knock-out tournament. Competitors are divided into two groups of four, playing three round-robin matches against the other three players in their group. The two best players in each group progress to the semifinals, and the winners meet in the final to determine the champion.