![US Open Tennis on X: "On this day in 1980, 🇺🇸 John McEnroe became @atptour World No. 1 for the first time. McEnroe passed rival Bjorn Borg in the rankings, on the US Open Tennis on X: "On this day in 1980, 🇺🇸 John McEnroe became @atptour World No. 1 for the first time. McEnroe passed rival Bjorn Borg in the rankings, on the](https://pbs.twimg.com/media/EvjEZ1eXcAQq-Wd.jpg)
US Open Tennis on X: "On this day in 1980, 🇺🇸 John McEnroe became @atptour World No. 1 for the first time. McEnroe passed rival Bjorn Borg in the rankings, on the
Lot - Clarence Sinclair Bull (American, 1896-1979), Marion Davies with tennis racquet, circa 1930s, gelatin silver print, Sight: 13 x 9 3/4 in. (33 x 24.8 cm.)
United States Tennis Association - USTA (Official) - In 1979, she became the youngest US Open female singles champion in history... Happy Birthday, Tracy Austin! 🎉 | Facebook
![National Championships Tennis 1979 Scheveningen Frits Don in action Date: 16 August 1979 Location: Scheveningen, South-Holland Keywords: sport, tennis Personname: Don, Frits Stock Photo - Alamy National Championships Tennis 1979 Scheveningen Frits Don in action Date: 16 August 1979 Location: Scheveningen, South-Holland Keywords: sport, tennis Personname: Don, Frits Stock Photo - Alamy](https://l450v.alamy.com/450v/2ar4ygj/national-championships-tennis-1979-scheveningen-frits-don-in-action-date-16-august-1979-location-scheveningen-south-holland-keywords-sport-tennis-personname-don-frits-2ar4ygj.jpg)