| Final 12:00 | | time | | L | | 1. Samuel Ogazi |  Nigeria | 44.25s | | 5 | | 2. Jereem Richards |  Trinidad Tobago | 44.82s | | 4 | | 3. Zakithi Nene |  South Africa | 45.21s | | 2 | | 4. Lee Eppie |  Botswana | 45.31s | | 6 | | 5. Tom Reynolds |  Australia | 45.57s | | 7 | | 6. Muzala Samukonga |  Zambia | 45.61s | | 8 | | 7. Zandrion Barnes |  Jamaica | 45.68s | | 1 | | 8. Udo Edidiong | Nigeria | 45.81s | | 3 |
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| World Record: Wayde van Niekerk, South Africa 43.03s 14 Aug 2016 Rio de Janeiro, Brazil | | Commonwealth Record and Games Record: Kirani James, Grenada 44.24s 30 Jul 2014 Glasgow, Scotland |
| Semi 1 | | time | | L | | 1. Samuel Ogazi | Nigeria | 44.52s | Q | 5 | | 2. Lee Eppie | Botswana | 45.26s | Q | 6 | | 3. Zandrion Barnes | Jamaica | 45.38s | q | 8 | | 4. Lythe Pillay | South Africa | 45.87s | | 7 | | 5. Jaden Marchan | Trinidad Tobago | 45.89s | | 4 | | 6. Vishal Thennarasu |  India | 46.33s | | 3 | | 7. Kennedy Luchembe | Zambia | 46.60s | | 2 | | 8. George Mutuku |  Kenya | 47.22s | | 1 |
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| Semi 2 | | time | | L | | 1. Tom Reynolds | Australia | 45.63s | Q | 5 | | 2. Muzala Samukonga | Zambia | 45.95s | Q | 7 | | 3. Christopher Morales Williams |  Canada | 45.99s | | 4 | | 4. Amal Glasgow |  Saint Vincent Gr. | 46.46s | | 3 | | 5. Delano Kennedy | Jamaica | 46.52s | | 8 | | 6. Michael Joseph |  Saint Lucia | 46.69s | | 1 | | 7. Kelvin Kiprotich Tonui | Kenya | 46.69s | | 6 | | -. Desean Boyce |  Barbados | DNF | | 2 |
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| Semi 3 | | time | | L | | 1. Jereem Richards | Trinidad Tobago | 45.06s | Q | 7 | | 2. Udo Edidiong | Nigeria | 45.55s | Q | 8 | | 3. Zakithi Nene | South Africa | 45.70s | q | 4 | | 4. Reece Holder | Australia | 45.99s | | 3 | | 5. Boniface Mweresa | Kenya | 46.24s | | 5 | | 6. Patrick Nyambe | Zambia | 46.46s | | 2 | | 7. Kalinga Kumarage |  Sri Lanka | 46.80s | | 1 | | -. Antonio Watson | Jamaica | DQ | | 6 |
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Heats - Tuesday, 28th July 12:00 |
| Heat 1 | | time | | L | | 1. Udo Edidiong | Nigeria | 45.73s | q | 4 | | 2. Desean Boyce | Barbados | 46.55s | q | 5 | | 3. Michael Francois |  Grenada | 46.62s | | 6 | | 4. Adoli Haron |  Uganda | 47.27s | | 3 | | 5. Rayvon Black |  Turks Caicos | 47.80s | | 8 | | 6. Revon Williams |  Guyana | 48.25s | | 7 | | 7. William Camilus Peka |  Papua New Guinea | 49.88s | PB | 2 | | 8. Muhammad Ismail |  Pakistan | 50.60s | SB | 1 |
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| Heat 2 | | time | | L | | 1. Kelvin Kiprotich Tonui | Kenya | 45.69s | q | 7 | | 2. Delano Kennedy | Jamaica | 45.82s | q | 5 | | 3. Michael Joseph | Saint Lucia | 45.84s | q | 8 | | 4. Patrick Nyambe | Zambia | 45.94s | q | 6 | | 5. Matthew Galea Soler |  Malta | 47.38s | | 4 | | 6. Bongumuzi Matsebula |  Eswatini | 49.23s | | 2 | | 7. Zeek Suad Hussain |  Maldives | 49.96s | | 3 | | 8. Howard Tapuaiga Siila |  Tuvalu | 55.96s | SB | 1 |
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| Heat 3 | | time | | L | | 1. Antonio Watson | Jamaica | 46.36s | q | 3 | | 2. George Mutuku | Kenya | 46.50s | q | 2 | | 3. Rajesh Ramesh | India | 47.43s | | 4 | | 4. Austin Cole | Canada | 47.87s | | 6 | | 5. Erick Okwii | Uganda | 47.91s | | 7 | | 6. Lerano Missick | Turks Caicos | 48.83s | | 8 | | 7. Riffath Adam | Maldives | 50.91s | | 5 |
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| Heat 4 | | time | | L | | 1. Zandrion Barnes | Jamaica | 45.13s | q, SB | 4 | | 2. Reece Holder | Australia | 45.63s | q | 2 | | 3. Jaden Marchan | Trinidad Tobago | 46.17s | q | 1 | | 4. Kennedy Luchembe | Zambia | 46.44s | q | 7 | | 5. Simeon Adams | Guyana | 47.35s | SB | 8 | | 6. Mohamed Bah |  Sierra Leone | 49.20s | SB | 6 | | 7. Mokheseng Kente |  Lesotho | 50.24s | | 5 | | 8. Adin Corbette |  Montserrat | 51.31s | | 3 |
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| Heat 5 | | time | | L | | 1. Jereem Richards | Trinidad Tobago | 45.72s | q | 5 | | 2. Kalinga Kumarage | Sri Lanka | 46.28s | q | 3 | | 3. Brodie Young |  Scotland | 46.57s | | 4 | | 4. Marvric Pamphile | Saint Lucia | 47.12s | | 7 | | 5. Kyle Gale | Barbados | 47.41s | | 2 | | 6. Mario Greenaway | Montserrat | 49.53s | | 8 | | 7. Adolf Kauba | Papua New Guinea | 50.06s | | 6 |
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| Heat 6 | | time | | L | | 1. Amal Glasgow | Saint Vincent Gren. | 46.03s | q | 5 | | 2. Vishal Thennarasu | India | 46.49s | q | 8 | | 3. Elvis Khikhoe Gaseb |  Namibia | 47.30s | | 1 | | 4. Joshem Sylvester | Grenada | 48.17s | | 3 | | 5. Daniel Baul | Papua New Guinea | 49.34s | | 6 | | 6. Md Lushad Islam |  Bangladesh | 49.76s | SB | 4 | | 7. Neo Ntelele | Lesotho | 51.20s | | 2 | | 8. Luka Desoiza |  Gibraltar | 51.23s | | 7 |
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| All Gold Medalists | | 2026: Samuel Ogazi(NGR) | | 2022: Muzala Samukonga(ZAM) | | 2018: Isaac Makwala(BOT) | | 2014: Kirani James(GRN) | | 2010: Mark Mutai(KEN) | | 2006: John Steffensen(AUS) | | 2002: Michael Blackwood(JAM) | | 1998: Iwan Thomas(WAL) | | 1994: Charles Gitonga(KEN) | | 1990: Darren Clark(AUS) | | 1986: Roger Black(ENG) | | 1982: Bert Cameron(JAM) | | 1978: Rick Mitchell(AUS) | | 1974: Charles Asati(KEN) | | 1970: Charles Asati(KEN) | | 440 Yards | | 1966: Wendell Mottley(TTO) | | 1962: George Kerr(JAM) | | 1958: Milkha Singh(IND) | | 1954: Kevan Gosper(AUS) | | 1950: Edwin Carr(AUS) | | 1938: Bill Roberts(ENG) | | 1934: Godfrey Rampling(ENG) | | 1930: Alex Wilson(CAN) |
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