Usain Bolt drew down the curtain on his brilliant Olympic career by securing a sweep of the sprint titles for a third successive games when Jamaica successfully defended the 4×100 metres relay crown. The Jamaicans won in 37.27 seconds to add the relay gold to the 100 metres and 200 Metres titles he had won for a third straight olympics. 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. Bolt helped jamaica land 4×100 meters relay gold, having already won the 100 meters and 200 meters individual titles, to match his feats at beijing 2008 and london 2012. Bolt, 29, has said the rio games will be his final olympics as he plans to retire from the sport after the 2017 world championships. He signs off having won all nine olympic finals in which he has appeared.