<p>Roger Federer said on Sunday he will undergo further knee surgery and admitted he "will be out for many months", a decision which casts further doubt on his future in tennis at the age of 40.</p>.<p>"I will be on crutches for many weeks and out of the game for many months," 20-time Grand Slam title winner Federer said in a video posted on his Instagram account.</p>.<p>The decision immediately rules him out of the US Open, where he has been champion five times and which starts in two weeks' time.</p>.<p>"I want to give myself a glimmer of hope to return to the tour in some shape or form," added Federer.</p>.<p>"I am realistic, don't get me wrong. I know how difficult it is at my age to go through another surgery. I will try it. I want to be healthy, I want to be running around."</p>.<p>Federer, who has played just 13 matches in 2021, underwent two knee surgeries in 2020 when he played only six times.</p>.<p>He had already pulled out of the Tokyo Olympics to rest his knee.</p>.<p><strong>Also Read | </strong><a href="https://www.deccanherald.com/sports/tennis/roger-federer-turns-40-with-career-at-crossroads-1016739.html" target="_blank"><strong>Roger Federer turns 40 with career at crossroads</strong></a></p>.<p>Federer withdrew from this year's French Open after reaching the fourth round and was knocked out in the quarter-finals of Wimbledon, a tame 6-3, 7-6 (7/4), 6-0 loss to Poland's Hubert Hurkacz.</p>.<p>That defeat was only his 14th at the All England Club in 119 matches, and the first time he had been beaten in the tournament in straight sets since a first-round exit at the hands of Mario Ancic in 2002.</p>.<p>It was also the first time he had lost a set 6-0 at Wimbledon and just the third time at a Slam.</p>.<p>"I've been doing a lot of checks with the doctors on my knee," he added on Sunday.</p>.<p>"I hurt myself further during the grass-court season and it's just not the way to go forward.</p>.<p>"They told me to feel better I'll need surgery. I decided to do it."</p>.<p>After turning 40 last weekend, Federer said he was learning to adjust to the fact that recovering from niggles takes two weeks rather than two days.</p>.<p>"It was different before. The questions were simple: what is my place in the ranking? What will my next tournament be?", he told Blick newspaper.</p>.<p>"Today, it's more difficult: how do I feel when I start training again? What are my goals? How to reconcile all this with the family? What does the rest of the team say?</p>.<p>"I am much more enthusiastic than before, the attitude is different. It's really completely different from 10 years ago."</p>.<p>Federer captured his most recent major at the 2018 Australian Open.</p>.<p>He was already well past 36 and the second oldest man to clinch a Slam title</p>.<p>Since then, Novak Djokovic has claimed eight more majors and old rival Rafael Nadal has picked up four.</p>.<p>Both now stand level on 20 Slams with Federer.</p>.<p>Should Federer be preparing to bow out after 23 years on tour, he will leave behind a career decorated by 103 titles — only Jimmy Connors with 109 has more — a combined 310 weeks at number one and more than $130 million in prize money alone.</p>.<p>Later Sunday, the US Open confirmed Federer's withdrawal from the final Grand Slam event of the year with his spot in the draw taken by Tallon Griekspoor of the Netherlands.</p>.<p>Nadal remains a doubt for the US Open where he is a four-time champion.</p>.<p>The 35-year-old Spaniard suffered a foot injury in his semi-final loss to Djokovic at the French Open in June.</p>.<p>The Spaniard skipped Wimbledon and the Olympics and played just one match in Washington earlier this month before withdrawing from the Toronto and Cincinnati Masters events.</p>.<p>Djokovic is also skipping Cincinnati after his disappointing Olympics campaign.</p>.<p>The field, headed by Russian Daniil Medvedev, is without resting world number one Novak Djokovic plus injured Rafael Nadal and Roger Federer.</p>.<p>"Things are changing. Bodies are breaking down instead of top players being overtaken by tennis (progress)," said three-time major winner Andy Murray in Cincinnati on Sunday.</p>
<p>Roger Federer said on Sunday he will undergo further knee surgery and admitted he "will be out for many months", a decision which casts further doubt on his future in tennis at the age of 40.</p>.<p>"I will be on crutches for many weeks and out of the game for many months," 20-time Grand Slam title winner Federer said in a video posted on his Instagram account.</p>.<p>The decision immediately rules him out of the US Open, where he has been champion five times and which starts in two weeks' time.</p>.<p>"I want to give myself a glimmer of hope to return to the tour in some shape or form," added Federer.</p>.<p>"I am realistic, don't get me wrong. I know how difficult it is at my age to go through another surgery. I will try it. I want to be healthy, I want to be running around."</p>.<p>Federer, who has played just 13 matches in 2021, underwent two knee surgeries in 2020 when he played only six times.</p>.<p>He had already pulled out of the Tokyo Olympics to rest his knee.</p>.<p><strong>Also Read | </strong><a href="https://www.deccanherald.com/sports/tennis/roger-federer-turns-40-with-career-at-crossroads-1016739.html" target="_blank"><strong>Roger Federer turns 40 with career at crossroads</strong></a></p>.<p>Federer withdrew from this year's French Open after reaching the fourth round and was knocked out in the quarter-finals of Wimbledon, a tame 6-3, 7-6 (7/4), 6-0 loss to Poland's Hubert Hurkacz.</p>.<p>That defeat was only his 14th at the All England Club in 119 matches, and the first time he had been beaten in the tournament in straight sets since a first-round exit at the hands of Mario Ancic in 2002.</p>.<p>It was also the first time he had lost a set 6-0 at Wimbledon and just the third time at a Slam.</p>.<p>"I've been doing a lot of checks with the doctors on my knee," he added on Sunday.</p>.<p>"I hurt myself further during the grass-court season and it's just not the way to go forward.</p>.<p>"They told me to feel better I'll need surgery. I decided to do it."</p>.<p>After turning 40 last weekend, Federer said he was learning to adjust to the fact that recovering from niggles takes two weeks rather than two days.</p>.<p>"It was different before. The questions were simple: what is my place in the ranking? What will my next tournament be?", he told Blick newspaper.</p>.<p>"Today, it's more difficult: how do I feel when I start training again? What are my goals? How to reconcile all this with the family? What does the rest of the team say?</p>.<p>"I am much more enthusiastic than before, the attitude is different. It's really completely different from 10 years ago."</p>.<p>Federer captured his most recent major at the 2018 Australian Open.</p>.<p>He was already well past 36 and the second oldest man to clinch a Slam title</p>.<p>Since then, Novak Djokovic has claimed eight more majors and old rival Rafael Nadal has picked up four.</p>.<p>Both now stand level on 20 Slams with Federer.</p>.<p>Should Federer be preparing to bow out after 23 years on tour, he will leave behind a career decorated by 103 titles — only Jimmy Connors with 109 has more — a combined 310 weeks at number one and more than $130 million in prize money alone.</p>.<p>Later Sunday, the US Open confirmed Federer's withdrawal from the final Grand Slam event of the year with his spot in the draw taken by Tallon Griekspoor of the Netherlands.</p>.<p>Nadal remains a doubt for the US Open where he is a four-time champion.</p>.<p>The 35-year-old Spaniard suffered a foot injury in his semi-final loss to Djokovic at the French Open in June.</p>.<p>The Spaniard skipped Wimbledon and the Olympics and played just one match in Washington earlier this month before withdrawing from the Toronto and Cincinnati Masters events.</p>.<p>Djokovic is also skipping Cincinnati after his disappointing Olympics campaign.</p>.<p>The field, headed by Russian Daniil Medvedev, is without resting world number one Novak Djokovic plus injured Rafael Nadal and Roger Federer.</p>.<p>"Things are changing. Bodies are breaking down instead of top players being overtaken by tennis (progress)," said three-time major winner Andy Murray in Cincinnati on Sunday.</p>