Sept. 12 (UPI) -- Carlos Alcaraz, 19, officially became the youngest No. 1 player in ATP rankings history, while Ons Jabeur climbed to No. 2 in the WTA rankings and Serena Williams jumped 284 spots, the tennis organizations said Monday.
Canada's Felix Auger-Aliassime dropped out of the Top 10, falling from No. 8 to No. 13. American Frances Tiafoe moved inside the Top 25 due to his run to the semifinals at the U.S. Open. Tiafoe moved from No. 26 to No. 19.