Petra Kvitova says she is "fortunate to be alive" after being attacked with a knife and robbed in her home in Prostejove, Czech Republic.
The 26-year-old injured her racket-holding left hand in the assault, which saw 5,000 Czech Koruna (around £155) stolen, according to sport.cz.
"I am shaken, but fortunate to be alive," the two-time Wimbledon champion wrote on Facebook.
"The injury is severe and I will need to see specialists, but if you know anything about me I am strong and I will fight this."
Kvitova thanked supporters for their messages of support, described the attack and said that her racket-holding left hand was injured as she defended herself.
"Thank you for all your heartwarming messages," she added.
"As you may have already heard, today I was attacked in my apartment by an individual with a knife.
"In my attempt to defend myself, I was badly injured on my left hand.
"Thank you all again for your love and support and now I would appreciate some privacy while I focus on my recovery."
Her publicist Karel Tejkal said it was not a targeted attack.
He told sport.cz: "It is apparently a random criminal act, Petra is now in the care of doctors."
Kvitova has now gone to Brno Trauma Hospital for assessment of her injuries, which are not thought to be life threatening.
Earlier on Tuesday Kvitova announced on Twitter she would be missing January's Hopman Cup in Perth, Australia as she continues to recover from a foot injury.
Kvitova has two grand slam titles, winning Wimbledon in 2011 and 2014.
She has two WTA singles titles in 2016 and a career total of 19, with career prize money of more than US dollars 22.8million (around £18.4m).
She is currently ranked 11th in the world.
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