I was inspired to do this post when I saw that many news sources, including The Telegraph and Guardian, claimed this guy was Petra Kvitova's father. He may have been the most noticeable face in Kvitova's box, but he is not the 2011 Wimbledon champion's father. I found that the man is Jaroslav Navratil, a former professional tennis player from Czechoslovakia.
Here are photos of Kvitova's father Jiri Kvita, who introduced Kvitova to tennis.
Jiri is a teacher.
In the photo below you can see Kvitova's brothers Jiri and Libor, and her mother Pavla. Father Jiri is in blue shirt.