is both the youngest world No. 1 (19 years, 4 months), and the youngest year-end No. 1 (19 years, 7 months). Federer is the oldest No. 1 (), while Djokovic is the oldest year-end No. 1 (). Federer is the player with the longest time span (14 years) between his first and most recent dates (February 2004 – June 2018) at No. 1, while Rafael Nadal has the longest time span (11 years) between his first and last (2008–2019) year-end No. 1 ranking. Two players, Ivan Lendl and Marcelo Ríos, have reached No. 1 without previously having won a major singles title. Lendl reached No. 1 on February 21, 1983, but did not win his first Grand Slam title until the 1984 French Open. Ríos reached No. 1 on March 30, 1998, but retired without ever having won a Grand Slam title, making him the only No. 1 player with that distinction. Federer holds the record of wire-to-wire No. 1 for three consecutive calendar years. Since 1973 when the ATP rankings started, there have been 13 years in which one player held the top spot for the entire year: Jimmy Connors in 1975, 1976, and 1978; Lendl in 1986 and 1987; Pete Sampras in 1994 and 1997; Hewitt in 2002; Federer in 2005, 2006, and 2007; and Djokovic in 2015 and 2021. In contrast, 1999 saw five players hold the No. 1 ranking (the most in any single year): Sampras, Carlos Moyá, Yevgeny Kafelnikov, Andre Agassi, and Patrick Rafter. Prior to 2009, Federer accumulated the most year-end ATP ranking points in any season, with 8,370 points in 2006. Since the introduction of a new point scale for the ATP rankings from 2009, Djokovic achieved the same feat with 16,585 ranking points in 2015 season. Djokovic also holds the record of 16,950 ranking points on 6 June 2016, the most ATP points ever accumulated by any player. John McEnroe held the No. 1 ranking a record 14 times, and Sampras is the only other player to have held it 10 or more times, with 11 stints. Rafter spent the least time at number 1 (one week). ATP No. 1 ranked singles players The statistics are updated only when the ATP website revises its rankings (usually on Monday mornings except when tournament finals are postponed). Weeks at No. 1 {| |-style="vertical-align:top" | Total {| class="wikitable nowrap" style="text-align:center" |- !scope="col"|Rank !scope="col" style="width:180"|Player !scope="col"