Margaret Court

This record includes her calendar Grand Slam in 1970, achieved during a dominant run that spanned pre-Open Era and Open Era competition, culminating in a famous 6-4, 6-1, 6-2 victory over Billie Jean King in the 1970 Wimbledon final. Her serve-and-volley style and powerful left-handed game were 20% more efficient in converting break points than her contemporaries, solidifying her legacy as one of the game's greatest.