Noah Lyles of the United States raced to victory in the 100 metres at the World Athletics Championships on Sunday, his first world title over the distance, while Uganda's Joshua Cheptegei took gold in the 10,000m.
The two-times world champion in the 200m pulled ahead over the final 50m to cross in a personal best 9.83 seconds, matching the world-leading time this season.
Letsile Tebogo of Botswana clocked a time of 9.88 for silver, while Britain's Zharnel Hughes also ran 9.88 for bronze.
The two-times world champion in the 200m will now go for the sprint double, last achieved by Usain Bolt in 2015.
The defending world champion Fred Kerley of the US failed to qualify for the final after running 10.02 in his semi-final.
Uganda's Joshua Cheptegei delivered a devastating last lap to win a third successive World Championship 10,000 metres gold despite barely competing over 25 laps in the last three years.
The world record holder over 5000m and 10,000m has had an injury-hit year and struggled to hit his top form but, on a hot, humid night in Budapest he broke clear approaching the bell and stamped his authority over the field with a 53-second last lap to come home in 27:51.42.
Daniel Simiu Ebenyo of Kenya took silver with Selemon Barega of Ethiopia the bronze.
Katarina Johnson-Thompson's athletics career appeared in doubt after a catastrophic ruptured Achilles tendon less than three years ago, but the British heptathlete became a world champion once again in a remarkable comeback story.
The 30-year-old, who also won the world title four years ago in Doha, secured heptathlon gold with a gutsy second-place finish in the 800 metres, the gruelling final event. Her personal-best time of two minutes 5.63 seconds was good enough to take the title.
"I just knew I could prove to myself and prove to all the people that I could still do it," an emotional Johnson-Thompson said. "This is the culmination of so much hard work. I'm so happy I'm crying. I can't help it. Today I know if I believed in myself I could do it."
Johnson-Thompson finished with 6,740 points while 22-year-old Anna Hall of the United States, last year's world bronze medallist, captured the silver with 6,720 and Anouk Vetter of the Netherlands took the bronze (6,501). Kate O'Connor finished 13th with a total of 6145 points.
Canada's Ethan Katzberg took a stunning World Championship hammer gold with a massive national record throw of 81.25 metres in the fifth round.
Katzberg had smashed his personal best by more than two metres in qualifying and looked as if he could not believe he had triumphed in the final.
Poland's Olympic champion Wojciech Nowicki took silver with 81.02, with Hungary's Bence Halasz bronze in 80.82.
Pole Pawel Fajdek, seeking a sixth successive world title to match the record of pole vaulter Sergey Bubka, finished fourth.
