Grand Slam king will need time to recovery from muscle tear in his left leg.
Keys can't play the event in Austin due to her Top-10 ranking.
The 29-year-old had to learn to love her career, with our with a major, before winning a Grand Slam
Jannik Sinner is out and Stefanos Tsitsipas is in the Rotterdam field.
World No. 1 Jannik Sinner won't be defending his Rotterdam title next month.
AO Tournament Director Craig Tiley makes a confident prediction on Grand Slam king's AO future.
AO breakout stars Learner Tien and Nishesh Basavareddy are set for Delray Beach qualifying February 7-9th.