Roger Federer shares thoughts on retirement before final match

AP photo by Kin Cheung / Roger Federer practices Wednesday at London's O2 Arena, where the 20-time Grand Slam singles champion will close his pro tennis career with a Laver Cup doubles match Friday.

LONDON — Roger Federer is a father of four — two girls who are 13, two boys who are 8 — and so perhaps that is why, as he wraps up his playing career at age 41, he thinks about the GOAT debate that has engulfed the tennis world the way parents might look at their children.

Folks love to ask: Who's the greatest of all time in men's tennis — Federer, Rafael Nadal or Novak Djokovic?

"People always like to compare. I see it every day with my twins. Without wanting, you compare them. You shouldn't — ever," Federer said during an interview with The Associated Press on Wednesday, hours after his farewell news conference at the arena that will host the 20-time Grand Slam singles champion's final competition, the team-based Laver Cup.