On Sunday, Roger Federer will call time on a career that has spanned 24 years and seen him become one of the greatest tennis players of all time.

Federer has won 20 Grand Slam singles titles and 103 ATP Tour titles, as well as attracting legions of fans around the world.

As he prepares to retire, BBC Sport look backs at 10 iconic moments in his career - and asks you to vote for your favourite.

Wimbledon 2001 - beating Sampras at age 19

Pete Sampras was the top dog at Wimbledon. In 2001 he was the four-time defending champion, world number one and heavy favourite for the title.

Then, in the fourth round, he came up against a pony-tailed 19-year-old who was starting to move up the rankings himself.

Federer, the boys' champion at Wimbledon in 1998, came through 7-6 (9-7) 5-7 6-4 6-7 (2-7) 7-5 in three hours and 41 minutes to end Sampras' Wimbledon dominance.

It would be the first of many stunning results on Centre Court for the Swiss great.

Wimbledon 2003 - first Grand Slam title

Federer would win eight of his 20 major singles title at Wimbledon

It was fitting that Federer won his first Grand Slam at Wimbledon, which he has often described as his favourite tournament.

Having failed to go beyond the quarter-finals in his previous outings at a major, Federer dropped just one set on his way to the final, where he beat Australia's Mark Philippoussis 7-6 (7-5) 6-2 7-6 (7-3).

An emotional Federer dedicated his win to former coach Peter Carter, who died in a car accident the previous year.

"Peter was one of the most important people in my career," he said. "I hope he saw it from somewhere."

The victory was the start of a period of dominance, with the Swiss winning 11 of his majors between 2004 and 2007.

Wimbledon 2008 - Epic final against Nadal

Before Wimbledon in 2008, Federer and Nadal had won 14 of the previous 16 Grand Slam titles

Federer may have lost but the final between him and Rafael Nadal in 2008 is widely regarded as one of the greatest matches of all time.

Federer was bidding for a sixth consecutive singles title but Nadal had thrashed him in the French Open final a few months previously and held an 11-6 winning record over the Swiss.

Played out over seven hours because of rain delays, Federer lost the first two sets, saved two championship points in the fourth and forced a fifth before Nadal claimed a stunning victory in near darkness.

It ended Federer's unbeaten run of 65 matches on grass and was arguably the peak of an enthralling rivalry that lasted until Federer's retirement.

Beijing 2008 - Olympic doubles gold

Federer and Wawrinka would team up again at the Davis Cup in 2014

Federer arrived at the Beijing Olympics just a month after his loss to Nadal at Wimbledon and on the verge of losing his world number one ranking to the Spaniard after 236 weeks at the top.

Having lost in the quarter-finals in the singles, he and Stan Wawrinka teamed up for the men's doubles and claimed a big victory over the Bryan brothers of United States in the semi-finals.

They then beat Sweden's Simon Aspelin and Thomas Johansson 6-3 6-4 6-7 (4-7) 6-3 to give Switzerland their first Olympic tennis medal since 1988.

It would be the only Olympic gold of Federer's career.

French Open 2009 - Completes career Grand Slam

Federer was appearing in his fifth successive major final, having won the US Open the previous year

By 2009, the only thing that eluded Federer was the French Open title. He had reached the final in Paris for the past three years but had lost each one to Nadal.

Federer had claimed just his second victory over Nadal on clay in the build-up to Roland Garros but Nadal was once again the heavy favourite to lift the trophy.

However, Nadal's shock defeat by Robin Soderling in the fourth round put things in motion for Federer.

Federer seized his opportunity, ultimately beating Soderling 6-1 7-6 (7-1) 6-4 in the final to become the sixth man to win all four Grand Slam singles titles.

Wimbledon 2009 - Record-breaking 15th Slam title

The Wimbledon match between Federer and Roddick was the longest final in terms of games played in Grand Slam history

Federer avenged his heart-breaking loss to Nadal the previous year by winning Wimbledon in 2009 - but the final was just as draining.

Federer beat Andy Roddick 5-7 7-6 (8-6) 7-6 (7-5) 3-6 16-14 across four hours and 17 minutes, with the fifth set alone lasting 95 minutes.

It was Federer's sixth Wimbledon title and his 15th major trophy, taking him beyond Sampras' all-time record as the American watched on from the Royal Box.

The victory also sent Federer back to the top of the world rankings.

Wimbledon 2012 - Beats Murray in final

Federer's win in 2012 saw him regain the world number one ranking from Novak Djokovic

Federer arrived at his favourite tournament having not won a Grand Slam title since January 2010, and having gone out in the quarter-finals in his last two appearances at SW19.

He came through a five-set match in the third round before ousting defending champion and top seed Novak Djokovic in the semi-finals.

Waiting in the final was Andy Murray, bidding to become the first British man since 1936 to win a major singles trophy.

But Federer spoilt the home party with a 4-6 7-5 6-3 6-4 win, tying Sampras' Open era record of seven Wimbledon men's singles titles and regaining the world number one ranking in the process.

Murray would have his revenge a few weeks later on the same court as he beat Federer to win Olympic gold.

2014 Davis Cup - Triumph with Switzerland

Federer was left in tears after Switzerland won the Davis Cup

Federer had helped Switzerland reach their first Davis Cup final in 22 years but was struggling with a back injury, leading him to withdraw from the ATP World Tour final just a few weeks before the showpiece event in Lille.

Against France, Federer lost his first singles rubber to Gael Monfils, leaving the tie level at 1-1.

He and Wawrinka teamed up for the doubles and won and Federer was chosen to play Richard Gasquet, knowing that victory would secure the trophy for Switzerland.

Federer beat Gasquet in straight sets, sparking jubilant scenes and leading an emotional Federer to dedicate the trophy to "the boys".

Australian Open 2017 - Surprise major title after injury lay-off

Federer's victory at the Australian Open secured his 18th major singles trophy

Federer arrived in Australia having spent six months out with a knee injury and with many saying he would not win a major title again.

It was not easy for Federer - he beat two top-10 players in Kei Nishikori and Tomas Berdych and ousted Wawrinka in five sets on his way to the final, where long-time rival Nadal awaited.

In another epic that almost inevitably went to five sets, Federer won 6-4 3-6 6-1 3-6 6-3 to claim an 18th Grand Slam title and his first for five years.

It was the first time Federer, now 35, had beaten Nadal at a major since the 2007 Wimbledon final.