| Final | | 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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| venue: Scotstoun Stadium, Glasgow |
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| 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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| 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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