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Usain Bolt had little trouble qualifying for the final of the men's Olympic 200m final but Justin Gatlin missed out on a place.
Bolt is bidding to complete the 100m-200m double at his third successive Olympic Games and he posted his fastest time of the season in his semi-final to comfortable book his place in Friday's final.
The Jamaican clocked 19.78 seconds but he believes he can go even faster and is targeting his world record of 19.19 seconds.
"I definitely think I can try for the world record, I definitely feel that," he said. "I need to run efficiently and get into the straight and run the perfect race."
Gatlin had finished second to Bolt in the 100m final but the American could only finish third in his semi-final, while Yohan Blake also failed to qualify for the final, finishing sixth in a time of 20.37 seconds.
Speaking about Gatlin's failure to qualify, Bolt told BBC Racing 5 live: "Everybody's in shock. You can tell from the 100m he's getting old. It's a fact the older you get, the rougher it gets to double.
"Next year if I go to the World Championships [in London] I'm not going to double. I'm going to do the 100m and that is it."
Bolt's compatriot Elaine Thompson completed the sprint double in Rio as she clocked 21.78 seconds to beat Netherlands' world champion Dafne Schippers in the women's 200m final.
Having already taken gold in the 100m earlier this week, Thompson becomes the first woman to complete the Olympic sprint double since Florence Griffiths-Joyner at the 1988 Seoul Games.
Schippers pushed Thompson all the way to the line but she had to settle for second by 0.13 seconds, while American Tori Bowie took bronze in 22.15.
"It is a very special and welcoming feeling for me. I think my light has shined," Thompson told BBC Sport.
"Watching Veronica Campbell-Brown, Shelly-Ann Fraser-Pryce and then putting my name there is an amazing feeling."
The Americans completed a clean sweep in the women's 100m hurdle final with Brianna Rollins finishing ahead of her team-mates Nia Ali and Kristi Castlin.
Rollins won in a time of 12.48 seconds with Ali taking silver in 12.59. However, Castlin faced a nervous wait to discover her fate before it was confirmed that she had crossed the line third in 12.61.
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