The World of Sport Reacts to Roger Federer's Retirement

The outpouring of praise and admiration in the wake of Roger Federer's retirement announcement is a testament to the Swiss tennis star's remarkable impact and legacy in the world of tennis, sport and beyond.

Where Federer's on-court achievements rank among the greats in the men's game -- though he is no doubt in the top three -- will be up for debate, but there is no question he is the most transcendent tennis player to ever pick up a racket.

Nobody else in the sport has garnered the global adoration, the endorsements or become an icon quite like Federer.

Twenty two-time grand slam champion Rafael Nadal, whose career-long rivalry with Federer produced some of the most memorable matches in the sport's history, called it an "honor and privilege" to compete against him.

Federer's success at Wimbledon, winning the title at the All England Club eight times, meant he became synonymous with the green grass of Centre Court. He last lifted the trophy there in 2017, 13 years after his first Wimbledon win.

"Roger, where do we begin?" the tournament's official page wrote. "It's been a privilege to witness your journey and see you become a champion in every sense of the word.

Seven-time Super Bowl champion Tom Brady said in a press conference on Thursday: "Phenomenal, great player, you know, he's just a great competitor and you know ... he had a great run, he was great, always respectful of everybody and meant a lot."

Tennis pioneer and Hall of Famer Billie Jean King wrote on Twitter: "Roger Federer is a champion's champion. He has the most complete game of his generation & captured the hearts of sports fans around the world with an amazing quickness on the court & a powerful tennis mind.

Current women's world No. 1 and three-time grand slam champion Iga Swiatek added: "I just want to thank you for everything you've done and everything you are for our sport. It's been a privilege to witness your career. I wish you all the best."