Radim Zondra, 33, went into her house in December 2016 and he had to inspect the boiler.
He then caught Kvitova from behind and held a knife to her throat. She suffered severe wounds on her left hand in the struggle to free herself.
Looking at a regional court in Brno, Zondra refused all charges against him.
Last month Kvitova delivered picture testimony via video link, telling the court that there was”blood all over the place”.
She added that she had given him money to leave, finally committing him 10,000 Czech crowns (£341; $440).