Roger Federer to retire from professional tennis at the age of 41

Roger Federer has announced he will retire from top-level professional tennis later this month.

The 20-time Grand Slam singles champion, widely viewed as one of the greatest players in the history of the sport, has confirmed that next week's Laver Cup in London will be his final ATP event.

"I will play more tennis in the future, of course, but just not in Grand Slams or on the tour," the 41-year-old posted on his social media accounts.

"This is a bittersweet decision, because I will miss everything the tour has given me. But at the same time, there is so much to celebrate."

Federer hasn't played tournament tennis since undergoing knee surgery, his third operation in an 18-month period, following his quarter-final exit at last year's Wimbledon.

The Swiss icon is set to finish his career with the third-most Grand Slam singles titles among men, behind only Rafael Nadal (22) and Novak Djokovic (21).

In an emotional letter posted on social media, Federer explained his decision to step away from the professional game.

"As many of you know, the past three years have presented me with challenges in the form of injuries and surgeries," he wrote.

"I've worked hard to return to full competitive form. But I also know my body's capacities and limits, and its message to me lately has been clear. I am 41 years old.

"I have played more than 1,500 matches over 24 years. Tennis has treated me more generously than I ever would have dreamt, and now I must recognise when it is time to end my competitive career."

Fans across the world took to social media to congratulate Federer on his stellar career.

"The greatest there was the greatest there is the greatest there will be," wrote one fan on Twitter.

Another added: "Thank you, Roger.

"Not only one of the GOATs of tennis, but one of the best athletes of all time in ANY sport. That glorious one-handed backhand will live on forever."

Long-time rival Nadal was also among those to pay tribute to Federer following his announcement.

"Dear Roger, my friend and rival. I wish this day would have never come. It’s a sad day for me personally and for sports around the world," Nadal posted on Twitter.

"It's been a pleasure but also an honor and privilege to share all these years with you, living so many amazing moments on and off the court.

"We will have many more moments to share together in the future, there are still lots of things to do together, we know that.

"For now, I truly wish you all the happiness with your wife, Mirka, your kids, your family and enjoy what’s ahead of you. I’ll see you in London."