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.
Images from the World Athletics Championships in Eugene, Oregon, on Tuesday, Day 5.
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.
Usain Bolt returned to the scene of his triple Olympic glory and duly delivered for 60,000 camera-flashing fans as he overcame a slow start to win the 100 metres and give the London Anniversary Games the Friday finale it demanded.
Star Indian javelin thrower Neeraj Chopra has undergone an elbow surgery
A summary of sports events and persons who made news on Thursday
'There was no pressure and I was taking it (Olympics) just like any other event. It was like I have played against these athletes before and there's no reason to worry. I was able to focus on my performance. That has helped me win gold.'
US sprinter Justin Gatlin believes he is steadily catching up with Olympic and world champion Usain Bolt as the two head towards a likely showdown at the Rio de Janeiro Summer Games next 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
She threw a distance of 63.72m in the women's discus throw at the National Inter-State #Athletics Championship to punch her ticket to the Games.
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.
Olympic 200 metres gold medallist Allyson Felix has chosen to run the 400 metres at next month's world championships, her coach told Reuters on Wednesday.
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.
A summary of sports events and sports persons, who made news on Thursday
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.
Rediff.com has the best sports images from the events in the week gone by snapped right here...
Wearing a T-shirt that read "This is Paris," Messi beamed and waved at scores of fans who had come to greet him at Le Bourget airport on the outskirts of the French capital after his flight from Barcelona.
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 Saturday.
Triple jumper Arpinder Singh created history by becoming the first Indian to win a medal in the IAAF Continental Cup as he clinched a bronze but star javelin thrower Neeraj Chopra finished sixth with a below-par show, in Ostrava, Czech Republic, on Sunday.
Neeraj is currently ranked fourth in the new rankings of the international federation.
Neeraj Chopra will have the weight of expectations on him when he begins his World Athletics Championship campaign on Thursday.
Qatar's Akram Afif has been named Asian Player of the Year at the Asian Football Confederation's annual awards in Hong Kong on Monday, with Saki Kumagai from Japan claiming the women's prize.
Track and field success at the Olympics has largely eluded India
Prominent deep-pocketed investors are lined up to finance Major League Cricket, the world's top players are supposedly ready to sign on and, according to the ICC and USA Cricket research, there is a baked-in fan base of between 15 and 20 million waiting to be served.
'Didn't realise was flanked by Chinese and Pakistani athletes on victory podium'
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.
Adrian Barath (63) led a stunning power-hitting show as Trinindad & Tobago breezed into the semifinals of the Champions League T20 after beating Diamond Eagles by 24 runs in a high scoring League A match in Hyderabad on Sunday.
'Most of our elite athletes are in national camps so they are safer.' 'They don't have to go out to buy vegetables or groceries; they are not as exposed as we are.' 'Most of them work for government organisations, they get salaries and stipends.'
Summary of sports events and persons who made news on Thursday
Rodrigues, Kaur, Mandhana and Sharma were also a part of the now-defunct Kia Super League (KSL) in 2019, the ECB's domestic T20 tournament that made way for the Women's Hundred.
The diamond-studded Indian Premier League winner's trophy, encrusted with rubies and yellow and blue sapphires, was unveiled in Mumbai on Monday by IPL chairman and commissioner Lalit Modi
The autopsy, which was based on blood and urine samples and released by the Buenos Aires Scientific Police, said Maradona had problems with his kidneys, heart and lungs.
A summary of sports events and sports persons, who made news on Saturday
Indian athletes will begin their campaign in the World Championships in Beijing, on Sunday.
A summary of sports events and persons who made news on Monday.
Britain's double Olympic champion Mo Farah said on Tuesday he was '100 per cent clean.'
Usain Bolt waltzed in to sprinkle a bucket of stardust over Rio on Monday, and while there were Samba smiles and dancing girls, the biggest name at the Olympics could not escape the ever-present specter of doping.
