Petra Kvitová

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FILE - In this July 5, 2014, file photo, Petra Kvitova, of Czech Republic, holds the trophy after winning the women's singles final against Eugenie Bouchard at the All England Lawn Tennis Championships in Wimbledon, London. Kvitova still has not regained full strength in her left hand, the one she uses to swing a tennis racket _ and the one that was stabbed by an attacker at her home in December. The two-time Wimbledon champion is simply thrilled to be back on tour, and she's seen as a serious title contender on the grass on which she excels.(AP Photo/Sang Tan, File)

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FILE - In this Friday, Dec. 23, 2016, file photo, Czech Republic's tennis player Petra Kvitova makes a statement to the media in Prague, Czech Republic. Kvitova still has not regained full strength in her left hand, the one she uses to swing a tennis racket _ and the one that was stabbed by an attacker at her home in December. (AP Photo/Petr David Josek, file)

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FILE - In this May 26, 2017, file photo, Petra Kvitova of the Czech Republic adjusts her hair during a press conference at Roland Garros stadium in Paris. Kvitova will continue her comeback from a knife attack by playing at the Connecticut Open in August, the final WTA tune-up before the U.S. Open. The two-time Wimbledon champion returned to tennis at the French Open, less than six months after suffering a serious injury to her left hand when she was stabbed by an intruder at her home in the Czech Republic. (AP Photo/Christophe Ena, File)

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Petra Kvitova of the Czech Republic reacts during a press conference at the Roland Garros stadium, Friday, May 26, 2017 in Paris. Kvitova has confirmed she is making her comeback at the French Open, less than six months after being attacked by a knife-wielding intruder. Kvitova has missed all season so far while recovering from surgery on her left, racket-holding hand in December. (AP Photo/Christophe Ena)

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Petra Kvitova of the Czech Republic adjusts her hair during a press conference at the Roland Garros stadium, Friday, May 26, 2017 in Paris. Kvitova has confirmed she is making her comeback at the French Open, less than six months after being attacked by a knife-wielding intruder. Kvitova has missed all season so far while recovering from surgery on her left, racket-holding hand in December. (AP Photo/Christophe Ena)

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Petra Kvitova of the Czech Republic smiles during a press conference at the Roland Garros stadium, Friday, May 26, 2017 in Paris. Kvitova has confirmed she is making her comeback at the French Open, less than six months after being attacked by a knife-wielding intruder. Kvitova has missed all season so far while recovering from surgery on her left, racket-holding hand in December. (AP Photo/Christophe Ena)

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FILE - In this Friday, Dec. 23, 2016 file photo, Czech Republic's tennis player Petra Kvitova makes a statement to the media in Prague, Czech Republic. Two-time Wimbledon champion Petra Kvitova is to decide by the week’s end whether she will be available to play the French Open following a recovery from an attack by a knife-wielding intruder. (AP Photo/Petr David Josek, file)

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FILE - In this Friday, Dec. 23, 2016 file photo, Czech Republic's tennis player Petra Kvitova leaves after making a statement to the media in Prague, Czech Republic. Two-time Wimbledon champion Petra Kvitova is to decide by the week’s end whether she will be available to play the French Open following a recovery from an attack by a knife-wielding intruder. (AP Photo/Petr David Josek, file)

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FILE - In this Oct. 4, 2016, file photo, Petra Kvitova, of the Czech Republic, watches her shot during her women's singles match against Wang Yafan of China at the China Open tennis tournament in Beijing. Two-time Wimbledon champion Petra Kvitova is back at practice, less than six months after being attacked by a knife-wielding intruder. Kvitova posted a photo on Instagram on Tuesday, May 2, 2017, showing herself swinging a tennis racket. (AP Photo/Andy Wong, File)

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Czech Republic's tennis player Petra Kvitova holds a statement for media in Prague, Czech Republic, Friday, Dec. 23, 2016. Two-time Wimbledon champion was injured Tuesday Dec. 20, 2016 when a knife-wielding intruder attacked her at her home in the town of Prostejov. Kvitova underwent nearly four hour surgery on her left hand. (AP Photo/Petr David Josek)

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Czech Republic's tennis player Petra Kvitova leaves after holding a statement for media in Prague, Czech Republic, Friday, Dec. 23, 2016. Two-time Wimbledon champion was injured Tuesday Dec. 20, 2016 when a knife-wielding intruder attacked her at her home in the town of Prostejov. Kvitova underwent nearly four hour surgery on her left hand. (AP Photo/Petr David Josek)

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Czech Republic's tennis player Petra Kvitova smiles while holding a statement for media in Prague, Czech Republic, Friday, Dec. 23, 2016. Two-time Wimbledon champion was injured Tuesday Dec. 20, 2016 when a knife-wielding intruder attacked her at her home in the town of Prostejov. Kvitova underwent nearly four hour surgery on her left hand. (AP Photo/Petr David Josek)

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Czech Republic's tennis player Petra Kvitova holds her hand after addressing media in Prague, Czech Republic, Friday, Dec. 23, 2016. Two-time Wimbledon champion was injured Tuesday Dec. 20, 2016 when a knife-wielding intruder attacked her at her home in the town of Prostejov. Kvitova underwent nearly four hour surgery on her left hand. (AP Photo/Petr David Josek)

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Czech Republic's tennis player Petra Kvitova holds a statement for media in Prague, Czech Republic, Friday, Dec. 23, 2016. Two-time Wimbledon champion was injured Tuesday Dec. 20, 2016 when a knife-wielding intruder attacked her at her home in the town of Prostejov. Kvitova underwent nearly four hour surgery on her left hand. (AP Photo/Petr David Josek)

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The Hand And Plastic Surgery Institute in Vysoke nad Jizerou, 125 km northeast of Prague, where Czech tennis player Petra Kvitova underwent surgery, is pictured Wednesday, Dec, 21, 2016. The surgery on the two-time Wimbledon champion's left hand was successful and she is recovering. Kvitova was injured Tuesday when a knife-wielding intruder attacked her at her home in the town of Prostejov. The attacker is still at large. (Radek Petrasek/CTK via AP) SLOVAKIA OUT

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Surgeon Radek Kebrle speaks of a surgery of Czech tennis player Petra Kvitova during a press conference in the hospital in Vysoke nad Jizerou, 125 km northeast of Prague, Wednesday, Dec. 21, 2016. The surgery on the two-time Wimbledon champion's left hand was successful and she is recovering. Kvitova was injured Tuesday when a knife-wielding intruder attacked her at her home in the town of Prostejov. The attacker is still at large. (Radek Petrasek/CTK via AP) SLOVAKIA OUT

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A photograph of Czech tennis player Petra Kvitova lies on a tennis racket during a charity tennis exhibition in Brno, Tuesday, Dec. 20, 2016. Two-time Wimbledon champion Kvitova had to cancel the event because she has been injured during an attack in her flat in the Czech Republic. Kvitova’s spokesman Karel Tejkal said Tuesday Dec. 20, 2016. She suffered a left hand injury and has been treated by doctors. (Vaclav Salek/CTK via AP) SLOVAKIA OUT

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A woman crosses a street in front of the house where Czech tennis player Petra Kvitova has been attatcked and injured in her flat in Prostejov, 260 kilometres east of Prague, on Tuesday, Dec. 20, 2016. Two-time Wimbledon champion Petra Kvitova has been injured during an attack in her flat. Kvitova’s spokesman Karel Tejkal says Tuesday Dec. 20, 2016 Kvitova suffered a left hand injury and has been treated by doctors. (Ludek Perina/CTK via AP)

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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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FILE - In this Nov. 12, 2016 file picture Czech Republic's Petra Kvitova returns the ball to France's Caroline Garcia during the Fed Cup final in Strasbourg, eastern France. Two-time Wimbledon champion Petra Kvitova has been injured during an attack in her flat in the Czech Republic. Kvitova’s spokesman Karel Tejkal says Tuesday Dec. 20, 2016 Kvitova suffered a left hand injury and has been treated by doctors. (AP Photo/Jean-Francois Badias,file)