The successes took the US to a tally of 14 gold and 29 medals in total, well clear of Kenya and Jamaica in the medals table for the 10-day championships in the Gulf state.
Dalilah Muhammad, who set a world record in the women’s 400m hurdles final Friday, ran a blistering third leg of the 4 x 400 to win her second gold of the meet with Poland a distant second and Jamaica third.
It also marked a second gold for Allyson Felix, who competed in the preliminaries for the US, but did not run the final.
The 33-year-old, who was part of the winning US combination in the new 4 x 400 mixed relay, now has 13 world championship golds, two clear of Usain Bolt.
It has been a remarkable return to competition for Felix, who gave birth to daughter Camryn last November by C-section after serious complications with her pregnancy.
New mother Ali also showed recent pregnancy is no bar to track and field glory, holding off compatriot and world record holder Kendra Harrison in the sprint hurdles final.
Ali won in a personal best time of 12.34 seconds then celebrated in the Khalifa Stadium with Yuri, her 13-month-old daughter, and her other child, four-year-old Titus.
The final event of the championships saw the US men’s quartet ease to victory in the 4 x 400 relay in two minutes 56.69 seconds, over a second clear of Jamaica with Belgium taking the bronze.
It wrapped up the best world championships for the US for 12 years, buoyed by the early sprint successes for the likes of Christian Coleman and Noah Lyles, and leaves the team in good stead ahead of next year’s Tokyo Olympics.
In comparison with the sparse crowds that have been criticized, the final day of the championships was well attended, with strong African support for the distance running events.
It reached fever pitch as Hoshua Cheptegei of Uganda held off the challenge of Yomif Kejelcha of Ethiopia to win the men’s 10,000m in the second fastest time in the championships history of 26 minutes 48.36 seconds.
He was shoulder to shoulder with Kejelcha on the final lap before pulling clear, going one better than his silver in the 2017 championships in London.
Rhonex Kipruto had to settle for bronze for Kenya, but the distance running powerhouse took gold in the men’s 1500m as Timothy Cheruiyot dominated from start to finish.
The 2012 Olympic champion Taoufik Makhloufi took the silver for Algeria ahead of Poland’s Marcin Lewandowski.
Elsewhere, in a busy flurry of final day competition, there were golds for world leader Malaika Mihambo of Germany in the women’s long jump and a surprise javelin success for Anderson Peters of Grenada.
Peters, the two-time US Collegiate champion, won with a mighty throw of 86.89 meters, bettering his personal best by more than two meters.
The more favored Magnus Kirt of Estonia took the silver medal and was unable to take his final attempt after injuring his arm with his fifth round effort and departing the arena on a medical cart, while Germany’s Johannes Vetter took the bronze.
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