A tennis player can win a Grand Slam and still not be world No. 1. The ranking is a running measure of results, not a lifetime award—and its history includes stretches of dominance that lasted for years, as well as sudden changes when a new generation arrived.
The modern men’s and women’s rankings began at different times and are maintained separately. Knowing when they started, how No. 1 is decided, and which players held the position longest makes the record books far easier to read.
When did the world No. 1 rankings begin?
The ATP introduced its computerized singles ranking on August 23, 1973. Romania’s Ilie Năstase was the first man ranked No. 1. The WTA’s computer ranking began on November 3, 1975, with Chris Evert at the top.
Those dates mark the start of an official, points-based record—not the beginning of the idea of a best player. Before computer rankings, tennis authorities, journalists, and tournament organizers made their own assessments. Those judgments can be useful for understanding earlier eras, but they are not directly comparable to the weekly ranking lists that followed.
The ATP and WTA rankings are separate competitions. A man and a woman can each be world No. 1 at the same time, and neither ranking is a combined measure of every tennis player.
How does a player become No. 1?
In simple terms, a player earns ranking points through tournament results, and the points count toward a rolling 52-week total. Big events offer more points, and advancing further generally earns more than an early exit. As old results fall outside the 52-week window, players need fresh results to replace them.
That rolling system explains why the rankings can change even when two leading players have similar records at the Grand Slams. A player’s schedule, results at other tournaments, and the timing of points dropping off all matter. It also explains why the No. 1 position is about consistency across the season, not just one spectacular fortnight.
The weekly ranking and the year-end No. 1 are related but different milestones. The weekly list can change throughout the season. The year-end title goes to the player ranked first when the season closes.
Records that define the No. 1 history
Two records tell different stories: total weeks at No. 1 measures sustained time on top, while consecutive weeks shows how long a player held the position without interruption. The established record figures below are useful reference points; ranking totals can change if a player later returns to No. 1.
| Record | Player | Figure | What it shows |
|---|---|---|---|
| Most ATP weeks at No. 1 | Novak Djokovic | 428 weeks | Long-term success across multiple periods |
| Longest consecutive ATP reign | Roger Federer | 237 weeks | A remarkable uninterrupted run from 2004 to 2008 |
| Most WTA weeks at No. 1 | Steffi Graf | 377 weeks | The longest total reign in either singles ranking |
| Longest consecutive WTA reign | Steffi Graf and Serena Williams | 186 weeks each | Two unmatched runs of sustained control |
Federer’s 237 consecutive weeks are a particularly striking example of what the ranking rewards. He stayed No. 1 from February 2004 until August 2008, a period that included 12 of his 20 major singles titles. Djokovic’s record total, meanwhile, was built across separate spells at the top. Returning to No. 1 after losing it can add to a player’s total weeks without extending a consecutive streak.
On the women’s side, Graf and Williams each held No. 1 for 186 weeks in a row. Graf’s 377 total weeks remain the benchmark for either tour, while Williams accumulated 319 weeks across several spells. Their records show why consecutive and total weeks should not be treated as interchangeable.
Year-end No. 1: a different kind of achievement
A year-end No. 1 finish rewards the player who ends a full season at the top. It often reflects a strong campaign from start to finish, but it does not require a player to hold the weekly No. 1 ranking for all 12 months.
Novak Djokovic has the most ATP year-end No. 1 finishes, with eight. Pete Sampras finished six consecutive seasons at No. 1 from 1993 through 1998—a record run of its own. On the WTA Tour, Graf holds the record with eight year-end finishes; Martina Navratilova had seven.
These records also underline a useful distinction: one player can lead in total year-end finishes, while another owns a notable consecutive streak. When comparing careers, it helps to say exactly which record you mean.
Milestones beyond the all-time totals
Some No. 1 moments stand out because of who achieved them or how early they happened. Arthur Ashe became the first Black man to reach the ATP No. 1 position. Martina Hingis became the youngest player to reach the top of the WTA singles ranking at 16. On the men’s side, Lleyton Hewitt became the youngest ATP No. 1, aged 20.
Roger Federer was the oldest man to reach ATP No. 1, returning to the top at 36 in 2018. Serena Williams became the oldest woman to reach No. 1, doing so again at 35 in 2017. Those returns matter: a ranking peak is not always a single moment early in a career. Players can regain the position after injury, a dip in form, or the arrival of new rivals.
What a No. 1 ranking does—and does not—tell you
Reaching No. 1 is strong evidence of sustained excellence, but it does not settle every debate about greatness. Grand Slam titles measure success at the biggest events; weeks at No. 1 capture time at the top of a points-based system. The measures overlap, but they are not identical.
For example, a player can win a major without immediately moving to No. 1, especially if a rival has a large points lead. A top-ranked player can also go through a stretch without a Slam while continuing to collect strong results elsewhere. The best comparison depends on the question: titles, peak dominance, longevity, or consistency across a season.
Frequently Asked Questions
Who was the first world No. 1 in tennis?
Ilie Năstase was the first ATP No. 1 when the men’s computerized ranking began in 1973. Chris Evert was the first WTA No. 1 when the women’s ranking began in 1975.
Who has spent the most weeks at No. 1?
Steffi Graf holds the leading total for either singles tour, with 377 WTA weeks. Novak Djokovic holds the ATP record, with 428 weeks at No. 1.
Is year-end No. 1 the same as winning the most Grand Slams that year?
No. The year-end ranking reflects the points total across the season, including results from tournaments beyond the Grand Slams. A player can finish No. 1 without winning a major that year, or win a major without ending the season on top.
Are the ATP and WTA No. 1 rankings combined?
No. The ATP ranks men and the WTA ranks women, using separate ranking lists. Each tour can have its own singles No. 1 at the same time.
Final Thoughts
The history of tennis No. 1 rankings is a record of more than famous names. It shows how players handled the weekly demands of the tour, held off challengers, and sometimes climbed back to the top after losing it. For a quick comparison, remember the key distinction: total weeks measure a player’s overall time at No. 1, consecutive weeks measure an uninterrupted reign, and year-end No. 1 recognizes the season’s top-ranked player.
