The event will feature the top 7-ranked 21-and-under players in the world, plus a wild card.
The doubles final is set in London, and the No.1 rankings are locked up as well.
82 matches wore him down in 2017, but Dominic Thiem is not sure he'll schedule any differently in 2017.
The Serb airs is views on Davis Cup, and recommends some changes.
How well does Roger Federer know his own career history?
The Brazilian/Scottish duo clinches the ATP's year-end ranking.
The World No.6 had a breakthrough season that included her first major final.
