FILE - This is a Wednesday, Jan. 20, 2016 file photo of Petra Kvitova of the Czech Republic, clenches her left hand as she reacts after winning a point against Daria Gavrilova of Australia during their second round match at the Australian Open tennis championships in Melbourne, Australia. Two-time Wimbledon champion Petra Kvitova has been injured by a knife-wielding attacker at her home on Tuesday Dec. 20, 2016. The player's spokesman, Karel Tejkal, says Kvitova suffered a left hand injury and has been treated by doctors.(AP Photo/Aaron Favila, File)
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