Two-time Wimbledon champion Petra Kvitova suffered severe injuries to her playing hand on Tuesday defending herself from a knife-wielding intruder in her apartment, an attack she said left her "fortunate to be alive". The tennis world number 11 said she would need to consult specialists about the injury, and gave no indication when she might be able to play again. Kvitova was scheduled to participate in a charity event in the city of Brno on Tuesday with another Czech player, Lucie Safarova.