His ninth gold medal drew him level with Paavo Nurmi, the Finn who dominated distance running in the early 20th century, and American sprinter and long jumper Carl Lewis as the most successful Olympic track and field athletes.
Usain Bolt seals triple-triple as Jamaica win sprint relay
Bolt ran the anchor leg to add the Rio relay crown to the 100 metres and 200 metres titles he had already won for a third straight Games.
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Japan were second in 37.60 seconds to take a surprise silver while the United States took bronze in 37.62.
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