Usain Bolt beat Justin Gatlin to win the 200m and complete the sprint double at the World Championships in Beijing.
Defending champion Bolt, 29, won in 19.55 seconds, with American Gatlin taking silver in 19.74 in a repeat of Sunday's 100m final.
"There was never a doubt that I would win this one. I'm number one," Jamaican Bolt told BBC Sport after winning his 10th world title.
South Africa's Anaso Jobodwana was third and Briton Zharnel Hughes fifth.
Bolt, who will also compete in the 4x100m relay, added: "It means a lot to me.
"I'm happy to be a 10-time World Championships gold medallist, especially when people have been saying I would lose.
"I had the utmost confidence. As long as my coach is confident, I'm super confident."