The Briton, world champion in 2009 and silver medallist two years ago, has struggled to shake off a persistent left Achilles problem.
Usain Bolt says he thinks he will need to produce a time similar to the one that earned him gold at the Rio 2016 Games to win Saturday's 100m final at the World Athletics Championships in London.
Britain's double Olympic champion Mo Farah has said he will continue to work with coach Alberto Salazar who is being investigated by the U.S. Anti-Doping Agency (USADA).
A summary of sports events and persons who made news on Friday
The 32-year-old Queenslander, who won Olympic 100 metres hurdles gold at the 2012 London Games and the world title in 2011 and 2017, said she had been forced into the decision by a string of injuries.
Ethiopia's world indoor champion Genzebe Dibaba broke the 22-year-old world women's 1,500 metres record on a sultry night at the Monaco Diamond League meet.
Usain Bolt ran under 10 seconds for the first time this year as he narrowly won the 100 metres at the Monaco Diamond League meeting on Friday.
A summary of sports events and persons who made news on Thursday
The eight top men to watch at the World Athletics Championships in Doha, from September 27 to October 6.
Summary of sports events and persons who made news on Monday
A summary of sports events and persons in the news over the weekend.
Women's 100 metres world champion and Diamond Race leader Shelly-Ann Fraser-Pryce won.
Usain Bolt is promising to let American sprinter Justin Gatlin "feel his full wrath" as he zones in on an unprecedented treble-treble of gold medals at the Rio de Janeiro Olympics.
Summary of sports events and persons who made news on Tuesday
Usain Bolt's lack of form combined with his late withdrawal from the Jamaican 100 metres national trials on Thursday have raised more doubts about the future of the world's fastest man.
American Justin Gatlin stepped up his preparations for the Rio Olympics with an impressive victory in the 100 metres at the Diamond League in Shanghai on Saturday.
The Canadian was expected to be Bolt's main rival for his 100 metres crown in the Jamaican's farewell championship but he suffered a hamstring strain in training on Monday and will miss the rest of the season.
Cape Town-born Van Niekerk is the reigning 400m world champion and he broke Michael Johnson's 17-year-old world record to win Olympic Gold in Rio de Janeiro last year.
Liu Xiang reduced his fans to tears in his home Shanghai Stadium on Sunday as China's finest athlete was given a fittingly heartfelt send-off.
Summary of sports events and persons who made news on Thursday
World and Olympic champion Usain Bolt powered away late in the race to win the 100 metres in 9.8 seconds at the season-closing Diamond League meeting in Brussels on Friday.
Mo Farah brought down the curtain on his peerless track career in Britain by winning his farewell race on home soil on an emotional afternoon at the Birmingham Grand Prix Diamond League meeting on Sunday.
A summary of sports events and persons who made news on Friday.
Shelly-Ann Fraser-Pryce, the world's fastest woman, says she is looking forward to one day being lauded as 'one of the greatest' athletes.
Olympic and world champion Usain Bolt outsprinted fellow Jamaican Nickel Ashmeade and American Justin Gatlin to win the 100 metres at the Zurich Diamond League meeting on Thursday.
American champion Tyson Gay continued his impressive buildup to next month's World championships on Thursday by winning the 100 metres at Lausanne's Athletissima Diamond League meeting in 9.79 seconds.
A baffled Usain Bolt ran his worst turn ever as he barely won the 200 metres at the Adidas Grand Prix meet in a sluggish 20.29 seconds on a warm, windy day at Randall's Island in New York, on Saturday.
A summary of sports events and persons who made news on Thursday.
Summary of sports events and persons who made news on Thursday
Summary of sports events and persons who made news on Thursday
A summary of sports events and sports persons, who made news on Thursday
Justin Gatlin blasted out a warning that he is ready to challenge Usain Bolt's 100 metres hegemony when he stormed to a lifetime best 9.74 seconds to win the event in the opening Diamond League meeting of the season on Friday.
Head-to-head rivalries featuring the world's leading athletes are the best way forward for the beleaguered sport of track and field.
Caster Semenya is seen as a near-certainty for Olympic gold on the track in Rio and her expected success in the 800 metres looks just as sure to bring up further examination of her running credentials.
A summary of sports events and sports persons, who made news on Frisday.
Tearful former double sprint world champion Tyson Gay said on Sunday he has tested positive for a substance he could not identify and is pulling out of next month's world championships in Moscow.
Sprint king Usain Bolt aims to crown his legacy with an unprecedented Olympic threepeat at the Rio Games, and to top that off by running the first ever sub-19 seconds 200 meters.
'It was probably one of the most difficult decisions to take in my career so far. But I thought that it was time for me to take on a fresh and new challenge'
Britain's double Olympic champion Mo Farah said on Tuesday he was '100 per cent clean.'
World champion Asbel Kiprop's relentless pace proved too much for his rivals, including Mo Farah, as the Kenyan clocked the fastest 1,500 metres time since 2004 at the Monaco Diamond League meeting on Friday.
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