![US Open Tennis on Twitter: "On this day in 2001, 20-year-old 🇦🇺 @lleytonhewitt became the youngest World No. 1 in the history of the @atptour rankings. Hewitt won six titles that season, US Open Tennis on Twitter: "On this day in 2001, 20-year-old 🇦🇺 @lleytonhewitt became the youngest World No. 1 in the history of the @atptour rankings. Hewitt won six titles that season,](https://pbs.twimg.com/media/EnHUgQjVQAMVmaT.jpg)
US Open Tennis on Twitter: "On this day in 2001, 20-year-old 🇦🇺 @lleytonhewitt became the youngest World No. 1 in the history of the @atptour rankings. Hewitt won six titles that season,
![50 for 50: Lleyton Hewitt, 2001 men's singles champion - Official Site of the 2023 US Open Tennis Championships - A USTA Event 50 for 50: Lleyton Hewitt, 2001 men's singles champion - Official Site of the 2023 US Open Tennis Championships - A USTA Event](https://photo-assets.usopen.org/images/pics/large/f_LleytonHewitt.jpg)
50 for 50: Lleyton Hewitt, 2001 men's singles champion - Official Site of the 2023 US Open Tennis Championships - A USTA Event
![Tennis | Indian Wells 'Grandma' Williams hopes to put 2001 ordeal to rest 'Grandma' Williams hopes to put 2001 ordeal to rest - AS USA Tennis | Indian Wells 'Grandma' Williams hopes to put 2001 ordeal to rest 'Grandma' Williams hopes to put 2001 ordeal to rest - AS USA](https://img.asmedia.epimg.net/resizer/MSCj55X5nBcfmBJsdTqAWVAh3lA=/1472x1104/cloudfront-eu-central-1.images.arcpublishing.com/diarioas/OSPVXATSSFOPDM6OL2GU3ZZFY4.jpg)
Tennis | Indian Wells 'Grandma' Williams hopes to put 2001 ordeal to rest 'Grandma' Williams hopes to put 2001 ordeal to rest - AS USA
![Wimbledon Tennis Championships June 2001 Martina Hingis Tennis Player Pictured before the last game during her match v Ruano Pascual which she lost on first day Stock Photo - Alamy Wimbledon Tennis Championships June 2001 Martina Hingis Tennis Player Pictured before the last game during her match v Ruano Pascual which she lost on first day Stock Photo - Alamy](https://c8.alamy.com/comp/2FM5M3M/wimbledon-tennis-championships-june-2001-martina-hingis-tennis-player-pictured-before-the-last-game-during-her-match-v-ruano-pascual-which-she-lost-on-first-day-2FM5M3M.jpg)
Wimbledon Tennis Championships June 2001 Martina Hingis Tennis Player Pictured before the last game during her match v Ruano Pascual which she lost on first day Stock Photo - Alamy
![Torneo internazionale di Tennis ITF Combined 2001 Team - Città di Padova - memorial Lino Barbieri dal 7 al 14 agosto 2022 Torneo internazionale di Tennis ITF Combined 2001 Team - Città di Padova - memorial Lino Barbieri dal 7 al 14 agosto 2022](https://www.padovaoggi.it/~media/horizontal-hi/27278494956952/296162577_5391780314249932_3111074192168275847_n-2.jpeg)