Petra Kvitova of the Czech Republic hits a shot during her match against Kurumi Nara of Japan at the Wimbledon Tennis Championships in London, July 2, 2015. [Photo/Agencies]

Possibly even more impressive was Kvitova, whose 6-2 6-0 demolition of Kurumi Nara meant the defending champion has dropped only three games in two matches.

After four days of action the top four men's seeds have yet to drop a set between them, with only two going as far as a tiebreak.

It is a similar story on the women's side. Although third seed Simona Halep went out in the first round, the remaining top four players have also not dropped a set.