Let me apologize to any Czech posters who thought that I was trying to put Graf on a pedestal above Navratilova
No need to apologize at all, because like in the case of Navratilova or Hingis, many of Steffi's achievements can be considered as the success of Czech tennis. During her best years (including the Golden Slam year), she was coached by Pavel Složil, a former top Czech player, who took over the job from Steffi's father.
"Složil served as Steffi Graf's coach from mid-1986 until the end of 1991. Shortly after the start of his tenure as Graf's coach, she had her Grand Slam breakthrough year in 1987, winning six tournaments and then defeating Martina Navratilova in the French Open.
The next year, Graf achieved a calendar year's Grand Slam, a feat performed only twice before. She also won the 1988 Olympics singles and the Wimbledon Ladies doubles that same year.
From 1987 through 1991, coached by Složil, Graf won ten Grand Slam championships, competing at the Australian Open (1988-89-90), French Open (1987-88), Wimbledon (1988-89-91) and the U.S. Open (1988-89), plus numerous side tournaments"
I wouldn't mind if Petra took inspiration from both of these players.