Former No. 1 says he's rooting for success in World Cup-style Davis Cup Finals.
Grand Slam king sees 2020 as a a year of major breakthrough with a big caveat.
Dominic Thiem on why ATP Finals champion Stefaos Tsitsipas is impact player.
Alexander Zverev says we will see a new Grand Slam champion in 2020.
Grand Slam king cites four priorities for a successful 2020.
Andy Murray's comeback from surgery has prompted buddy Tim Henman to return as a coach.
Rafael Nadal on why his fifth year-end No. 1 ranking may be his most special.
