Jannik Sinner is the 29th player to reach World No. 1 in the history of the PIF ATP Rankings.
Ilie Nastase was the first in 1973 and, 51 years later, Sinner has joined the elite group, becoming the first Italian to accomplish the feat.
ATPTour.com is celebrating Sinner's ascent to No. 1 with a series of profiles of all 29 legends who have climbed to the pinnacle of mens' tennis.
[ATP APP]Jannik Sinner: The flying fox who climbed to the very top
All smiles: Carlos Alcaraz's joyful game carried him to No. 1
Daniil Medvedev: No. 1, One of a kind
Andy Murray: The man who ended the Big Three’s No. 1 reign
Novak Djokovic: The complete player
Rafael Nadal: The ultimate competitor
Federer On No. 1: 'I decided I would like to stay there'
Andy Roddick: The competitive rocket
Juan Carlos Ferrero: The humble mosquito
Lleyton Hewitt: Intense Aussie reached pinnacle at 20
Guga On No. 1: 'Highlight of my career by far'
Patrick Rafter: When nice guys finish first
Yevgeny Kafelnikov: The poker-faced workhorse
Carlos Moya: A Spanish pioneer
Marcelo Rios: The first South American No. 1
Thomas Muster: Tragedy to top spot
Andre Agassi: From rebel to philosopher
Pete Sampras: 'I let my racquet do the talking'
Jim Courier: 'You have to be extreme to be exceptional'
Boris Becker: From Wunderkind to World No. 1
Stefan Edberg: The No. 1 with grit & grace
Mats Wilander: 'Every ball comes back'
Ivan Lendl: The monk in the iron mask
John McEnroe: An artist at No. 1
Bjorn Borg: The Ice Man & Elvis, all in one
Connors on No.1: 'A lonely spot, but it has the best view'
John Newcombe: The man behind the mustache
[NEWSLETTER FORM]