Which nationality is tennis legend Roger Federer?

How many Grand Slam titles has Roger Federer won?

How many players participate in a singles tennis match?

Who is known as "The King of Clay" in tennis?

What year was the Women's Tennis Association (WTA) founded?

What is the rest period between each game in a tennis set?

What is the perfect score in a tennis set?

What is the name of the trophy awarded to the Wimbledon champion in the men's category?

Which of the following players is the winner of women's title of US Open tennis tournament 2015?

Which of the following players is the winner of men's title of US Open tennis tournament 2015?