Elaine Thompson-Herah became the first woman to win the 100, 200-meter double at two Olympic Games on Tuesday when the Jamaican ran 21.53 seconds to claim 200 gold at the Tokyo Games.
With Usain Bolt in retirement, Jamaica has installed a new ruler on the country's sprint throne, Thompson-Herah adding a national record over 200 to the 100 Olympic record she set on Saturday.
"Oh my god, it's amazing that I have ever seen this day. That I could complete another double, I can't believe it," said Thompson-Herah.
"I really had to pull it out to win the 200. It's a new PB (personal best) and a national record. I am so, so happy...Honestly I am so tired, my legs just need some rest. I've done so many races in the last few days, but I am very grateful."
The 29-year-old finished in clear air at the National Stadium, with Christine Mboma of Namibia crossing in 21.81, a new world under-20 record for the 18-year-old.
"This is my first Olympics. I came here for experience but I did better (than I expected). I am really happy with my performance. I am proud of myself," said Mboma, who won Namibia's first medal of the Olympics and only fifth ever.
American Gabrielle Thomas was third, 0.06 behind the silver medalist.
In the morning session, Norway's Karsten Warholm smashed his own men's 400-meter hurdles world record by 0.76 second in winning gold.
Warholm crossed the line in 45.94, beating American Rai Benjamin by 0.23 in a close race held in hot and humid conditions. Benjamin's 46.17 time would have broken Warholm's old world record of 46.70, clocked about a month ago.
"I always say that a perfect race doesn't exist, but this is the closest I think I've come," the 25-year-old Warholm said.
Benjamin, who is also 25, said it was the "best race in Olympic history," while admitting he needs time to process his loss.
Alison dos Santos of Brazil took the bronze at his first Olympics.
In the women's 800, U.S. athlete Athing Mu was a cut above, taking a 1-minute, 55.21-second win ahead of Keely Hodgkinson of Great Britain and American Raevyn Rogers.
The field events on Tuesday brought long jump gold for Germany's Malaika Mihambo. She landed the longest leap of the day in her sixth and final attempt to snatch gold.
Mihambo's 7.0-meter splash took the lead from American Brittney Reese, who finished in silver with 6.97.
Ese Brume of Nigeria finished third, two spots better than her Rio de Janeiro Olympic result in 2016.
Women's hammer was won by Anita Wlodarczyk, the Pole taking her third straight Olympic title in the event.
Wlodarczyk threw 78.48, well off her 2016 Games distance, but more than enough to beat Wang Zheng of China and another Polish thrower, Malwina Kopron.
Armand Duplantis of Sweden won men's pole vault gold, flying a full 5 centimeters clear of Christopher Nilsen of the United States and 15 cm higher than bronze medalist Thiago Braz of Brazil.
In an ominous sign for the competition, Canada's Andre de Grasse set a 19.73 men's national record in recording the fastest time of the 200-meter semifinals.
Kenneth Bednarek ran 19.83 for the second-fastest time but his American countryman Noah Lyles almost regretted a decision to relax down the stretch in the second heat.
The 2019 world champion over the distance only got through as a fastest third-place qualifier when he was beaten at the line by quick-finishing Liberian Joseph Fahnbulleh.
