Roger Federer and Zizou

Tennis star Roger Federer kept a promise he made to a young fan 5 years ago.

In 2017, Izyan Ahmad, known to most as Zizou, challenged Federer to a match during the U.S. Open press conference. "Can you please continue to play for eight, nine years so that I can play you when I go pro?" Zizou asked Federer.

"Yes," Federer replied, laughing. "Is that a promise?" Zizou followed up. "Pinky promise," Federer said with a smile.

Last week, Roger Federer fulfilled that promise.