Roger Federer
Billie Jean King
Stat by stat
Bars are scaled to the leader in this list.
The verdict
Dead even across the measured categories. Our all-time ranking places Roger Federer at #3 and Billie Jean King at #12.
Head-to-head FAQ
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The case for Roger Federer
Federer's statistical case rests on a peak no one has matched: between 2004 and 2008 he held the No.1 ranking for a record 237 consecutive weeks, reached 18 of 19 Grand Slam finals from 2005-2010, and made 23 consecutive Slam semifinals — a streak of durable excellence that may be the safest record in tennis. He finished with 20 majors, 310 total weeks at No.1, 103 tour titles (second in the Open Era only to Connors), a record 8 Wimbledons, and 6 ATP Finals crowns. The aesthetic argument — the effortless movement, the all-court shotmaking that drew Wallace's 'religious experience' essays — is inseparable from his impact: he globalised the sport's audience in the 2000s like no player before him. The counterargument is equally clear: losing head-to-heads against both Nadal (16-24) and Djokovic (23-27), and a 2004-07 stretch inflated by a weaker field than his rivals faced. His 2017 Australian Open, won at 35 off a six-month injury layoff by beating Nadal in five sets, remains the most romantic single result of the era.
The case for Billie Jean King
King won 12 Grand Slam singles titles and 39 majors across all disciplines, including a record 20 Wimbledon titles counting singles, doubles and mixed. But her importance dwarfs even those totals. In 1973 she founded the WTA, threatened to boycott the US Open until it became the first major to pay women and men equally, and beat 55-year-old Bobby Riggs in the 'Battle of the Sexes' before an estimated 90 million television viewers — a victory that reshaped public attitudes toward women's sport far beyond tennis. An aggressive serve-and-volley player and ferocious competitor, she reached world No.1 and won titles across grass, clay and hard courts over two decades. No player has done more to build the professional women's game or to win its economic and cultural battles, which is why her place among the immortals rests on a foundation the pure title-counters miss. The tour's premier team competition, the Billie Jean King Cup, now carries her name.