Top 5 Tennis Grand Slam Czech Men's Players in Open Era
Guess the 5 best players from Czech Republic in the Grand Slam (Wimbledon, Roland Garros, US Open, Australian Open) men's singles during the Open Era (since 1968) according to the criteria written in the comments.
Players born in in the current Czech Republic part of Czechoslovakia are conidered for this quiz
One of the players has obtained American citizenship at the end of his career, but still in this quiz