体坛英语新闻：Injury rules Olympic champ Rudisha out of World Championships

NAIROBI, Aug. 23 (Xinhua) -- Olympic 800m champion David Rudisha has ruled himself out of the World Championships, which will be held in Doha, Qatar from September 28 to October 6.

The 30-year-old has not taken part in any competitive race since July 2017 because of a nagging injury, a quad muscle strain and back problems.

Manager Michel Boeting confirmed that the world record holder will miss the Kenyan trials on September 13, which rules him out of making the national team and a chance to reclaim his world title in Doha.

"He won't be ready for the trials," Rudisha's manager said. "Therefore he wouldn't be at the World championships."

Back in 2013, Rudisha sat out more than one year of competition due to a right knee injury after running in New York.

However, he overcame the injury and went on to win the 2015 world and 2016 Olympic titles, becoming the first repeat Olympic men's 800m champion since New Zealand's Peter Snell in 1964.

Rudisha owns the three fastest times in history, including the world record 1:40.91 set in an epic 2012 Olympic final.

Last year, manager Boeting said he does not expect Rudisha to compete until August 2018.

It is a year now and Rudisha has shown little signs of returning to action. Instead, he has been enduring several visits to the doctors in Kenya and the Netherlands, which are yet to yield any success.

Rudisha has also endured an injury to his upper hamstring muscle, a similar problem that saw him miss out to defend his crown at the 2013 World Championships in Moscow, Russia.

His coach Brother Colm O'Connell now hopes Rudisha, who is the only man to have run under one minute and 41 seconds, will see the truth of the circumstances and call-out on his time.

"There is no point coming back and be there. If he is a championships runner and has a reputation, which he has to look at. He proved it in Rio Games coming back from injury largely based on his tactics because there were challenges and there were pretenders," O'Connell said.

In his absence, Kenya has relied on Africa silver medalist Emmanuel Korir, Commonwealth Games champion Wycliffe Kinyamal and Ferguson Rotich.

However, the trio have never been successful challenging the dominance of Botswana's Olympic silver medalist Nijel Amos.