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He qualified fastest for the final of the 400 metres at the [[2024 World Athletics U20 Championships]] in [[Lima, Peru]].[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-two-afternoon-lima-24-reid-walaza-koscak-han-amidzovski|website=World Athletics|date=29 August 2024|accessdate=29 August 2024|title= Reid and Walaza win world U20 100m titles in Lima}}] In the final he came away with the silver medal, running 46.08 seconds.[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-three-afternoon-lima-24-track-almayew-manuel-okon-halvorsen|website=World Athletics|accessdate=30 August 2024|title= Almayew sets steeplechase championship record to win world U20 title in Lima|date=30 August 2024}}] He also won a gold medal with the American 4 x 400 metres relay team.[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-five-afternoon-lima-24-fayisa-serem-ruland|website=World Athletics|date=1 September 2024|title= Fayisa flies to 1500m gold for Ethiopia on day five in Lima|accessdate=1 September 2024}}][{{cite web |url=https://athleticsweekly.com/young-athlete-news/usa-top-medals-table-at-world-under-20-champs-in-lima-1039992127/|website=Athletics Weekly|title= USA top medals table at World Under-20 Champs in Lima|first=Jason |last=Henderson |accessdate=Sep 1, 2024 |date=1 September 2024}}] |
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He qualified fastest for the final of the 400 metres at the [[2024 World Athletics U20 Championships]] in [[Lima, Peru]].[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-two-afternoon-lima-24-reid-walaza-koscak-han-amidzovski|website=World Athletics|date=29 August 2024|accessdate=29 August 2024|title= Reid and Walaza win world U20 100m titles in Lima}}] In the final he came away with the silver medal, running 46.08 seconds.[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-three-afternoon-lima-24-track-almayew-manuel-okon-halvorsen|website=World Athletics|accessdate=30 August 2024|title= Almayew sets steeplechase championship record to win world U20 title in Lima|date=30 August 2024}}] He also won a gold medal with the American 4 x 400 metres relay team.[{{cite web|url= https://worldathletics.org/competitions/world-athletics-u20-championships/lima24/news/report/day-five-afternoon-lima-24-fayisa-serem-ruland|website=World Athletics|date=1 September 2024|title= Fayisa flies to 1500m gold for Ethiopia on day five in Lima|accessdate=1 September 2024}}][{{cite web |url=https://athleticsweekly.com/young-athlete-news/usa-top-medals-table-at-world-under-20-champs-in-lima-1039992127/|website=Athletics Weekly|title= USA top medals table at World Under-20 Champs in Lima|first=Jason |last=Henderson |accessdate=Sep 1, 2024 |date=1 September 2024}}] |
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In April 2026, Davis broke the long-standing Arizona State college record for the outdoor record 400 m at the [[Mt. SAC Relays]] with a time of 44.29 seconds, surpassing the previous best which had stood for 58 years.[{{cite web|url= https://www.dyestat.com/gprofile.php?mgroup_id=44531&do=news&news_id=674620-Jayden-Davis-Runs-World-Leading-44-29-In-Men-039-s-400-At-Mt-SAC-Relays] |
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|access-date=19 April 2026| website=World Athletics}} In April 2026, Davis broke the long-standing Arizona State college record for the outdoor record 400 m at the [[Mt. SAC Relays]] with a time of 44.29 seconds, surpassing the previous best which had stood for 58 years.[{{cite web|url= https://www.dyestat.com/gprofile.php?mgroup_id=44531&do=news&news_id=674620-Jayden-Davis-Runs-World-Leading-44-29-In-Men-039-s-400-At-Mt-SAC-Relays] |
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|title= JAYDEN DAVIS RUNS WORLD-LEADING 44.29 IN MEN'S 400 AT MT. SAC RELAYS|accessdate=19 April 2026|date=18 April 2026|website=Dye Stat}} |
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|title= JAYDEN DAVIS RUNS WORLD-LEADING 44.29 IN MEN'S 400 AT MT. SAC RELAYS|accessdate=19 April 2026|date=18 April 2026|website=Dye Stat}} |