Nole to face Rafa in Madrid semi-final (Saturday at 16:00 CET)
Kei's withdrawal sends the defending champion into last 4 where he will face Rafael Nadal (ESP, 4).
US Open: Novak advances by walkover as injured Vesely withdraws
The top seed and defending champion will face Mikhail Youzhny (RUS) in the third round on Friday.
BNP Paribas Open: Novak through to semis as Tomic withdraws
The world no.1 has been given a walkover into the semi-finals after Bernard Tomic was forced to withdraw due to a back injury.