Rising stars Alex de Minaur and Frances Tiafoe both won on Wednesday, joining Roger Federer and Rafael Nadal in round three.
Roger Federer overcame Dan Evans to move into the Australian Open third round.
Chris Kermode's tenure as ATP chief is reportedly under threat, but Novak Djokovic says the player council is yet to declare a position.
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.