Describing his ATP Finals triumph as "the biggest title I have ever won", Alexander Zverev took the time to heap praise on Novak Djokovic.
A tie-break controversy marred the end of Alexander Zverev's ATP Finals win against Roger Federer, but the German has apologised.
John Isner put up a fight but was unable to prevent Alexander Zverev joining Novak Djokovic in qualifying from Group Guga Kuerten.
Changes to the format of the Davis Cup have been approved by the ITF board, with an AGM set to determine whether they will be introduced.
The draw for the Davis Cup World Group play-offs has been held, with top seeds Argentina up against Kazakhstan.
The Australian bad boy is one of the great sporting enigmas, but an on-song Nick Kyrgios is a force to be reckoned with, according to Jim Courier.
Great Britain will have to cope without Andy Murray when they face France in the Davis Cup. "It's obviously a big loss," said Leon Smith.
The Davis Cup could be altered to a best-of-three-sets format, but Rafael Nadal believes those changes do not go far enough.