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Novak Djokovic
Novak Djokovic turned pro in 2003 and, by the time he'd finished his run through the sport's record books, held more Grand Slam singles titles than any player in tennis history, male or female — 24 majors, passing both Rafael Nadal's and Roger Federer's totals despite starting his career slightly behind both of them. Djokovic holds the record for most weeks spent at world No. 1, more than 400 total, and won a record 10 Australian Open titles, making Melbourne Park the site of his single greatest tournament dominance the way clay was for Nadal and grass was for Federer. He completed the career Grand Slam, winning all four majors at least once, and in 2021 came within one match of the first calendar-year Grand Slam in men's tennis since 1969, losing the US Open final after winning the season's first three majors — a near-miss that still stands as one of the closest any player has come to the feat in the modern era. Djokovic's game is built on a foundation of elite return of serve and defensive flexibility that made him exceptionally difficult to hit through, a style that took longer to earn the same popular affection as Federer's or Nadal's but that ultimately produced the most statistically decorated career of the three.
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Serena Williams
Serena Williams turned pro in 1995 at 14 and, across a career that stretched into her late 30s, won 23 Grand Slam singles titles — the most of any player in the Open Era, which began in 1968, and one shy of Margaret Court's all-time record, set partly before the Open Era's start. In 2002 and 2003, Williams held all four major singles titles simultaneously — the Australian Open, French Open, Wimbledon, and US Open — a feat known as the "Serena Slam," and she repeated the achievement again in 2014-2015, becoming the only player in the Open Era to complete a non-calendar-year Grand Slam twice. She won four Olympic gold medals, one in singles (2012) and three in doubles alongside her sister Venus (2000, 2008, 2012), and the two sisters' rivalry, playing out over more than two decades including nine Grand Slam singles finals against each other, is one of the defining storylines in modern tennis. Williams reached a major final at the 2018 Wimbledon Championships less than a year after giving birth, a run that highlighted both her competitiveness and the physical demands elite tennis places on players returning from pregnancy — a topic her career helped push further into mainstream sports conversation than it had been before.
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