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When and where to watch World Athletics Championship, TV coverage

When and where to watch World Athletics Championship, TV coverage

Jamaica's Usain Bolt lays on the track after he pulled up injured in the final of the Men's 4x100m relay during the World Athletics Championships in London Saturday, Aug. 12, 2017.

Jamaica are aiming for a fifth successive world title in the event but will face a stiff challenge from the US who won the first heat in 37.70 seconds, with Christian Coleman, silver medalist in the 100 meters, running the anchor leg.

The world's most glorious athlete, Usain Bolt, finished his last race in the most inglorious fashion, walking across the finish line.

Mitchell-Blake went onto see off Coleman as Great Britain secured gold with a time of 37.47 seconds - a British record with Japan securing third place.

Five years ago Talbot and the 18-year-old Gemili messed up a changeover as Britain were disqualified in the semi-finals of their own Olympics on the same London track so it was a particularly sweet moment for the two.

Australian hurdling great Sally Pearson could well add a second world title to her trophy cabinet and banish memories of two years of injury hell.

Watch the dramatic end to Bolt's athletic's career in the video player above.

Instead, Britain upset the United States to take gold in 37.47 seconds. It's a massive team effort and we win as a team and lose as a team.

"I got boxed in early on - it doesn't normally happen but I got boxed in early and couldn't get out", he added. "He is still the best in the world", Gatlin said.

There are also gold medals to be won in the women's high jump and the men's javelin.

Defending champion Julius Yego of Kenya, with a season's best of 87.97m, Czech Jakub Vadlejch (88.02), Finn Tero Pitkamaki (88.27) and Greek Ionnis Kiriazis (88.01m) are sure to be in the mix for the medals. Rico Freimuth of Germany was in second place with 5,377 points, while Damian Warner of Canada had the fastest time in the hurdles of 13.63 seconds to move into third.

The result means Bolt, 100 and 200m world record holder, finishes his career with 14 world career medals, one behind American Allyson Felix, to go with eight Olympic golds.

The Jamaican super star will call time on his illustrious career after the IAAF World Championships in London.