The Czech won five titles, reeled off two mammoth win streaks and claimed 47 victories in 2018.
The Dane revealed the diagnosis after her season ended on Thursday at the WTA Finals.
The Swiss scampers in style to win a gorgeous point against Filip Krajinovic.
Hall of Famer says it's a matter of time: Serena will win more majors.
The Czech duo becomes the 40th and 41st WTA doubles No.1s.
What keeps Roger Federer young? His answer may surprise you.
