Jasmine Camacho-Quinn swept to victory in the Olympic 100m hurdles, claiming a first ever track and field gold for Puerto Rico.
The 24-year-old - who had set an Olympic record 12.26sec in the semi-finals - surged home to claim her first major title in 12.37sec.
World record-holder Keni Harrison of the United States took silver in 12.52sec while Jamaica's Megan Tapper claimed bronze in 12.55sec.
Camacho-Quinn had got off to a smooth start, edging clear after 30 metres and never relinquishing the lead.
She clipped the penultimate barrier in an otherwise flawless display but it was not enough to stop her romping home for gold.
"Waking up this morning, there was adrenaline just rushing. I was like, 'let's get it.' I was working on six hours of sleep - I didn't care, I had a goal. I definitely came here and accomplished that," she said afterwards.
"It's amazing. The first gold medal in track and field for Puerto Rico and the second gold medal ever - I don't know how to explain it right now but it really does mean a lot."
The defeat means Harrison's long wait for a major outdoor championship title will go on.
The American failed to qualify for the 2016 Olympics after suffering a shock loss in the trials, and then finished fourth at the World Championships in London a year later.
In Doha in 2019, she settled for a silver medal at the World Championships behind surprise winner Nia Ali.
Ali skipped the Olympics this year after having a third child with her partner, the Canadian sprinter Andre De Grasse.
The field was further depleted by the absence of reigning Olympic champion Brianna McNeal.
McNeal was ruled out of the Olympics after being handed a five-year ban for "tampering within the results management process" after a missed drugs test in January 2020.
The Bio
Name: Lynn Davison
Profession: History teacher at Al Yasmina Academy, Abu Dhabi
Children: She has one son, Casey, 28
Hometown: Pontefract, West Yorkshire in the UK
Favourite book: The Alchemist by Paulo Coelho
Favourite Author: CJ Sansom
Favourite holiday destination: Bali
Favourite food: A Sunday roast
F1 line ups in 2018
Mercedes-GP Lewis Hamilton and Valtteri Bottas; Ferrari Sebastian Vettel and Kimi Raikkonen; Red Bull Daniel Ricciardo and Max Verstappen; Force India Esteban Ocon and Sergio Perez; Renault Nico Hülkenberg and Carlos Sainz Jr; Williams Lance Stroll and Felipe Massa / Robert Kubica / Paul di Resta; McLaren Fernando Alonso and Stoffel Vandoorne; Toro Rosso TBA; Haas F1 Romain Grosjean and Kevin Magnussen; Sauber TBA
The specs: 2018 BMW R nineT Scrambler
Price, base / as tested Dh57,000
Engine 1,170cc air/oil-cooled flat twin four-stroke engine
Transmission Six-speed gearbox
Power 110hp) @ 7,750rpm
Torque 116Nm @ 6,000rpm
Fuel economy, combined 5.3L / 100km
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if you go
The flights
Air Astana flies direct from Dubai to Almaty from Dh2,440 per person return, and to Astana (via Almaty) from Dh2,930 return, both including taxes.
The hotels
Rooms at the Ritz-Carlton Almaty cost from Dh1,944 per night including taxes; and in Astana the new Ritz-Carlton Astana (www.marriott) costs from Dh1,325; alternatively, the new St Regis Astana costs from Dh1,458 per night including taxes.
When to visit
March-May and September-November
Visas
Citizens of many countries, including the UAE do not need a visa to enter Kazakhstan for up to 30 days. Contact the nearest Kazakhstan embassy or consulate.