Australia's tennis association increases prize money and employs more investigators in the fight against corruption.
Andy Murray and Johanna Konta will lead a contingent of six British singles players at the Australian Open next month.
Twelve-time Grand Slam winner Novak Djokovic parts company with coach Boris Becker after three years working together.
Roger Federer's comeback from a knee injury is delayed as he pulls out of the International Premier Tennis League.
Audio & Video
Judy Murray tells BBC Sport how stressful it is to watch her sons Andy and Jamie compete, and says she "never imagined" them both becoming world number one.
As Andy Murray becomes the first British singles player to top the world rankings since the current system was introduced in 1973, find out some of the numbers behind his achievement.
How to get into Tennis
How to get into tennis - a sport on the up in the UK. Find your nearest court and learn the basics with our guide
What's on BBC Sport this week
This week's sport on the BBC includes England's fourth Test with India, heavyweight boxing and European Cup rugby.
Tennis alerts, live guide and social media
Get the latest tennis headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.