Carlos Alcaraz's U.S. Open championship moved him to No. 1 at age 19, making him the youngest man to lead the ATP computerized rankings since they began in 1973.

Carlos Alcaraz becomes youngest world no.1 in men's tennis after US Open win, Casper Ruud at 2nd spot

Ashleigh Barty will become the first Australian woman to be ranked world number one in more than 40 years if she beats her doubles partner Julia Goerges in the final of the Nature Valley Classic in Birmingham on Sunday.

Ashleigh Barty a win away from world number one

Roger Federer has entered the quarter-final of ABN Amro World Tennis Tournament, If he wins then he will become the oldest player ever to be ranked world number one

Roger Federer eyes number one spot

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Carlos Alcaraz becomes youngest world no.1 in men's tennis after US Open win, Casper Ruud at 2nd spot

Ashleigh Barty a win away from world number one

Roger Federer eyes number one spot