Defending champion Ons Jabeur said on Monday she had withdrawn from the Madrid Open with a calf injury after retiring from the Stuttgart Open at the weekend.

Fritz, 25, rose to his highest career ranking despite a surprise loss to Wu Yibing in the Dallas semi-finals.

Novak Djokovic, Tunisian world number two Ons Jabeur and six other top players will form the first executive committee of the Professional Tennis Players Association (PTPA) as it fights for a seat at the table with the sport's governing organisations.