Step 1: Understanding the question.
Martina Hingis is known for becoming the youngest player to win five Grand Slam singles titles before turning 20. She was a tennis prodigy who dominated women’s tennis in the late 1990s.
Step 2: Analyzing the options.
- (a) Martina Hingis: Correct. Hingis won five Grand Slam singles titles before the age of 20.
- (b) Steffi Graf: Incorrect. Steffi Graf won multiple Grand Slams, but not five before turning 20.
- (c) Anna Kournikova: Incorrect. While famous, Anna Kournikova never won a Grand Slam title.
- (d) Monica Seles: Incorrect. Monica Seles was a great player but did not win five Grand Slam titles before 20.
Step 3: Conclusion.
The correct answer is (a), as Martina Hingis won five Grand Slam singles titles before she was 20.