Novak Djokovic is on course to become the longest-reigning world number one in the history of the world rankings.
The uncertainty surrounding Novak Djokovic's participation at this year's US Open appears to be over.
Emma Raducanu has confirmed her participation in the inaugural ATX Open in Austin, Texas, at the end of February.
Tommy Paul got the better of fellow American Ben Shelton to reach his first grand slam semi-final at the Australian Open.
Aryna Sabalenka will take on surprise package Magda Linette in the semi-finals of the Australian Open.
Two-time former champion Victoria Azarenka ended a 10-year wait to return to the Australian Open semi-finals with a straight-sets victory over Jessica Pegula.