Martina Navratilova

Martina Navratilova's 18 Grand Slam singles titles are supplemented by a record 31 major doubles crowns, giving her a combined 59 major trophies — more than double the count of #8 Pete Sampras's 14. She spent 332 weeks at world No. 1, including a record 156 consecutive weeks from 1982 to 1985. Navratilova's serve-and-volley style and fitness regimen were 20 years ahead of their time, yielding a career win percentage of 86.7% (1,442 wins against 220 losses). Her 1983 season, where she lost only one match, boasts a 98.9% win rate that outperforms #9 Serena Williams's best single-season percentage of 94.2%. This data makes her versatility across singles, doubles, and mixed doubles unmatched.