| Final 22:10 | time |   | L | SF | Bib |  | 1. Donavan Brazier |  USA | 1:42.34 | CR | 4 | 4. | 1871 |  | 2. Amel Tuka |  BIH | 1:43.47 | SB | 5 | 11. | 272 |  | 3. Ferguson Cheruiyot Rotich |  KEN | 1:43.82 |   | 7 | 2. | 1295 |  | 4. Bryce Hoppel |  USA | 1:44.25 | PB | 2 | 14. | 1896 |  | 5. Wesley Vázquez |  PUR | 1:44.48 |   | 6 | 1. | 1591 |  | 6. Adrián Ben |  ESP | 1:45.58 |   | 3 | 5.q | 647 |  | 7. Marco Arop |  CAN | 1:45.78 |   | 8 | 6. | 395 |  | 8. Clayton Murphy |  USA | 1:47.84 |   | 9 | 3.q | 1919 |   
                                 |  Split time |  | 400m: Wesley Vázquez (PUR) 48.99s |   
 | 
 | 
 
| World Record: David Rudisha, Kenya 1:40.91 24 years, London (GBR) 9 Aug 2012 |  | Championship Record: Billy Konchellah, Kenya 1:43.06 26 years, Roma (ITA) 1 Sep 1987 |  | World Leading: Nijel Amos, Botswana 1:41.89 24 years, Monaco (MON) 12 Jul 2019 |   
 | 
 |  
|
 |   |  | Best 2 from each of 3 Semis and Best 2 times (from Semi 1) advanced to Final. Temperature --° C, Humidity 71 % |   
| Semi 1 21:55 | time |   | L | Rk. | Bib |  | 1. Wesley Vázquez |  PUR | 1:43.96 | Q | 7 | 1. | 1591 |  | 2. Ferguson Cheruiyot Rotich |  KEN | 1:44.20 | Q | 4 | 2. | 1295 |  | 3. Clayton Murphy |  USA | 1:44.48 | q | 5 | 3. | 1919 |  | 4. Adrián Ben |  ESP | 1:44.97 | q PB | 2 | 5. | 647 |  | 5. Elliot Giles |  GBR | 1:45.15 |   | 8 | 7. | 828 |  | 6. Adam Kszczot |  POL | 1:45.22 |   | 9 | 9. | 1531 |  | 7. Abdessalem Ayouni |  TUN | 1:45.80 |   | 3 | 13. | 1765 |  | 8. Abubaker Haydar Abdalla |  QAT | 1:46.87 |   | 6 | 21. | 1593 |   
 | 
|  Split time |  | 400m: Abubaker Haydar Abdalla (QAT) 48.72s |   
 | 
 
| Semi 2 22:05 | time |   | L | Rk. | Bib |  | 1. Donavan Brazier |  USA | 1:44.87 | Q | 5 | 4. | 1871 |  | 2. Marco Arop |  CAN | 1:45.07 | Q | 6 | 6. | 395 |  | 3. Emmanuel Kipkurui Korir |  KEN | 1:45.19 |   | 4 | 8. | 1288 |  | 4. Brannon Kidder |  USA | 1:45.62 |   | 2 | 10. | 1905 |  | 5. Mostafa Smaili |  MAR | 1:45.78 |   | 9 | 12. | 1379 |  | 6. Tshepo Tshite |  RSA | 1:46.08 |   | 8 | 15. | 1645 |  | 7. Yassine Hethat |  ALG | 1:46.15 |   | 3 | 17. | 104 |  | 8. Jamie Webb |  GBR | 1:48.44 |   | 7 | 23. | 851 |   
 | 
|  Split time |  | 400m: Marco Arop (CAN) 52.17s |   
 | 
 
| Semi 3 22:15 | time |   | L | Rk. | Bib |  | 1. Amel Tuka |  BIH | 1:45.63 | Q | 5 | 11. | 272 |  | 2. Bryce Hoppel |  USA | 1:45.95 | Q | 4 | 14. | 1896 |  | 3. Álvaro De Arriba |  ESP | 1:46.09 |   | 3 | 16. | 651 |  | 4. Brandon McBride |  CAN | 1:46.21 |   | 7 | 18. | 412 |  | 5. Kyle Langford |  GBR | 1:46.41 |   | 8 | 19. | 845 |  | 6. Ngeno Kipngetich |  KEN | 1:46.61 |   | 6 | 20. | 1281 |  | 7. Pierre-Ambroise Bosse |  FRA | 1:47.60 |   | 9 | 22. | 761 |  | -. Oussama Nabil |  MAR | DQ |   | 2 |   | 1376 |   
 | 
|  Split time |  | 400m: Ngeno Kipngetich (KEN) 53.09s |   
 |  
|
  Heats - Saturday 28.09 17:15 |  | Best 3 from each of 6 Heats and Best 2 times advanced to Semi-Finals. Temperature 25° C, Humidity 67 % |   
| Heat 1 17:15 | time |   | L | Rk. | Bib |  | 1. Donavan Brazier |  USA | 1:46.04 | Q | 4 | 12. | 1871 |  | 2. Marco Arop |  CAN | 1:46.113 | Q | 3 | 16. | 395 |  | 3. Tshepo Tshite |  RSA | 1:46.54 | Q | 7 | 26. | 1645 |  | 4. Andreas Kramer |  SWE | 1:46.74 |   | 8 | 28. | 1711 |  | 5. Lucirio Garrido |  VEN | 1:46.89 |   | 2 | 30. | 2029 |  | 6. Mariano García |  ESP | 1:49.08 |   | 5 | 38. | 656 |  | 7. Luke Mathews |  AUS | 1:50.16 |   | 6 | 39. | 168 |  | 8. Min Min Zaw |  MYA | 1:56.85 | SB | 9 | 43. | 1418 |   
 | 
|  Split time |  | 400m: Marco Arop (CAN) 52.14s |   
 | 
 
| Heat 2 17:22 | time |   | L | Rk. | Bib |  | 1. Ngeno Kipngetich |  KEN | 1:46.07 | Q | 8 | 13. | 1281 |  | 2. Adrián Ben |  ESP | 1:46.117 | Q | 3 | 17. | 647 |  | 3. Jamie Webb |  GBR | 1:46.23 | Q | 2 | 22. | 851 |  | 4. Brannon Kidder |  USA | 1:46.29 | q | 4 | 23. | 1905 |  | 5. Jamal Hairane |  QAT | 1:46.40 |   | 6 | 24. | 2083 |  | 6. Marc Reuther |  GER | 1:47.31 |   | 5 | 33. | 927 |  | -. Nijel Amos |  BOT | DNS |   | 7 |   | 303 |   
 | 
|  Split time |  | 400m: Adrián Ben (ESP) 52.43s |   
 | 
 
| Heat 3 17:29 | time |   | L | Rk. | Bib |  | 1. Brandon McBride |  CAN | 1:45.96 | Q | 3 | 9. | 412 |  | 2. Abubaker Haydar Abdalla |  QAT | 1:46.11 | Q | 8 | 15. | 1593 |  | 3. Pierre-Ambroise Bosse |  FRA | 1:46.138 | Q | 4 | 18. | 761 |  | 4. Mouad Zahafi |  MAR | 1:46.56 |   | 5 | 27. | 1381 |  | 5. Peter Bol |  AUS | 1:46.92 |   | 6 | 31. | 159 |  | 6. Pol Moya |  AND | 1:48.52 |   | 9 | 37. | 138 |  | 7. Ryan Sánchez |  PUR | 1:54.46 |   | 2 | 42. | 1590 |  | 8. Roberto Belo Amaral Soares |  TLS | 2:02.43 |   | 7 | 44. | 1742 |   
 | 
|  Split time |  | 400m: Abubaker Haydar Abdalla (QAT) 50.80s |   
 | 
 
| Heat 4 17:36 | time |   | L | Rk. | Bib |  | 1. Ferguson Cheruiyot Rotich |  KEN | 1:45.98 | Q | 7 | 10. | 1295 |  | 2. Bryce Hoppel |  USA | 1:46.01 | Q | 8 | 11. | 1896 |  | 3. Abdessalem Ayouni |  TUN | 1:46.09 | Q | 6 | 14. | 1765 |  | 4. Oussama Nabil |  MAR | 1:46.17 | q | 5 | 20. | 1376 |  | 5. Adam Kszczot |  POL | 1:46.20 | q | 4 | 21. | 1531 |  | 6. Mohamed Belbachir |  ALG | 1:46.52 |   | 3 | 25. | 103 |  | 7. Mark English |  IRL | 1:47.25 |   | 2 | 32. | 2074 |   
 | 
|  Split time |  | 400m: Mark English (IRL) 51.89s |   
 | 
 
| Heat 5 17:43 | time |   | L | Rk. | Bib |  | 1. Emmanuel Kipkurui Korir |  KEN | 1:45.16 | Q | 5 | 1. | 1288 |  | 2. Mostafa Smaili |  MAR | 1:45.27 | Q | 3 | 2. | 1379 |  | 3. Wesley Vázquez |  PUR | 1:45.47 | Q | 6 | 3. | 1591 |  | 4. Yassine Hethat |  ALG | 1:45.666 | q | 8 | 7. | 104 |  | 5. Kyle Langford |  GBR | 1:46.138 | q | 9 | 18. | 845 |  | 6. Quamel Prince |  GUY | 1:48.41 |   | 7 | 36. | 1013 |  | 7. Mohammed Al-Suleimani |  OMA | 1:50.91 | PB | 2 | 40. | 1511 |  | 8. Benjamín Enzema |  GEQ | 1:51.69 | SB | 4 | 41. | 899 |   
 | 
|  Split time |  | 400m: Wesley Vázquez (PUR) 51.38s |   
 | 
 
| Heat 6 17:50 | time |   | L | Rk. | Bib |  | 1. Elliot Giles |  GBR | 1:45.53 | Q | 5 | 4. | 828 |  | 2. Clayton Murphy |  USA | 1:45.611 | Q | 4 | 5. | 1919 |  | 3. Amel Tuka |  BIH | 1:45.616 | Q | 3 | 6. | 272 |  | 4. Álvaro De Arriba |  ESP | 1:45.666 | q | 9 | 7. | 651 |  | 5. Andrés Arroyo |  PUR | 1:46.75 |   | 2 | 29. | 1588 |  | 6. Edose Ibadin |  NGR | 1:47.91 |   | 8 | 34. | 1456 |  | 7. Musa Hajdari |  KOS | 1:47.98 |   | 6 | 35. | 1333 |  | -. Samer Ali Saleh Al Johar |  JOR | DQ |   | 7 |   | 1207 |   
 | 
|  Split time |  | 400m: Edose Ibadin (NGR) 51.80s |   
 |  
|
 |   |  | Quota 48 athletes. Qualifiying Standard 1:45.80 - -- athletes. Qualification Period 07.09.2018 - 06.09.2019. |   
| Athlete | time | Venue | date |   | FR |  | 1. Nijel Amos |  BOT | 1:41.89 | Monaco (MON) | 12.07.2019 | S,AC,Q | DNS |  | 2. Ferguson Cheruiyot |  KEN | 1:42.54 | Monaco (MON) | 12.07.2019 | S,Q |  | 3. Donavan Brazier |  USA | 1:42.70 | Zürich (SUI) | 29.08.2019 | S,DL,Q |  | 4. Brandon McBride |  CAN | 1:43.51 | Zürich (SUI) | 29.08.2019 | S,AC,Q |  | 5. Amel Tuka |  BIH | 1:43.62 | Monaco (MON) | 12.07.2019 | S,Q |  | 6. Emmanuel Korir |  KEN | 1:43.69 | Zürich (SUI) | 29.08.2019 | S,Q |  | 7. Wesley Vázquez |  PUR | 1:43.83 | Paris (FRA) | 24.08.2019 | S,Q |  | 8. Clayton Murphy |  USA | 1:43.94 | Zürich (SUI) | 29.08.2019 | S,Q |  | 9. Marco Arop |  CAN | 1:44.25 | Lima (PER) | 10.08.2019 | S,Q |  | 10.Abubaker Haydar Abdalla |  QAT | 1:44.33 | Doha (QAT) | 22.04.2019 | S,AC,Q |  | 11.Ayanleh Souleiman |  DJI | 1:44.38 | Barcelona (ESP) | 17.07.2019 | S,Q |  | 12.Bryce Hoppel |  USA | 1:44.41 | Austin TX (USA) | 07.06.2019 | S,Q |  | 13.Jamie Webb |  GBR | 1:44.52 | London (GBR) | 20.07.2019 | S,Q |  | 14.Adam Kszczot |  POL | 1:44.61 | London (GBR) | 20.07.2019 | S,AC,Q |  | 15.Tshepo Tshite |  RSA | 1:44.69 | Pretoria (RSA) | 15.03.2019 | S,Q |  | 16.Ryan Sanchez |  PUR | 1:44.82 | Mayagüez (PUR) | 27.04.2019 | S,Q |  | 17.Andrés Arroyo |  PUR | 1:44.96 | Marietta GA (USA) | 17.05.2019 | S,Q |  | 18.Kyle Langford |  GBR | 1:44.97 | London (GBR) | 20.07.2019 | S,Q |  | 19.Elliot Giles |  GBR | 1:45.03 | London (GBR) | 20.07.2019 | S,Q |  | 19.Mostafa Smaili |  MAR | 1:45.03 | Barcelona (ESP) | 17.07.2019 | S,Q |  | 21.Pierre-Ambroise Bosse |  FRA | 1:45.07 | Paris (FRA) | 24.08.2019 | S,WC,Q |  | 22.Andreas Kramer |  SWE | 1:45.10 | London (GBR) | 20.07.2019 | S,Q |  | 23.Abdessalem Ayouni |  TUN | 1:45.17 | Rabat (MAR) | 28.08.2019 | S,Q |  | 24.Marc Reuther |  GER | 1:45.22 | Mannheim (GER) | 19.07.2019 | S,Q |  | 25.Kipngetich Ngeno |  KEN | 1:45.25 | Abidjan (CIV) | 20.04.2019 | S,Q |  | -. Taoufik Makhloufi |  ALG | 1:45.33 | Heusden (BEL) | 20.07.2019 | DNS |   |  | 26.Brannon Kidder |  USA | 1:45.39 | Azusa CA (USA) | 09.07.2019 | S,Q |  | 27.Nabil Oussama |  MAR | 1:45.42 | Rabat (MAR) | 28.08.2019 | S,Q |  | 28.Luke Mathews |  AUS | 1:45.51 | Perth (AUS) | 16.03.2019 | S,Q |  | 29.Peter Bol |  AUS | 1:45.56 | Barcelona (ESP) | 17.07.2019 | S,Q |  | 30.Álvaro de Arriba |  ESP | 1:45.57 | Madrid (ESP) | 25.08.2019 | S,Q |  | -. Ntando Mahlangu |  RSA | 1:45.57 | Pretoria (RSA) | 15.03.2019 | DNS |   |  | 31.Yassine Hathat |  ALG | 1:45.58 | Schifflange (LUX) | 18.08.2019 | S,Q |  | 31.Quamel Prince |  GUY | 1:45.58 | Marietta GA (USA) | 17.05.2019 | S,Q |  | 33.Edose Ibadin |  NGR | 1:45.60 | Nashville TN (USA) | 31.05.2019 | S,Q |  | 34.Mouad Zahafi |  MAR | 1:45.63 | Szczecin (POL) | 15.08.2019 | S,Q |  | 35.Mariano Garcia |  ESP | 1:45.67 | Madrid (ESP) | 25.08.2019 | S,Q |  | 36.Mohamed Belbachir |  ALG | 1:45.75 | Rehlingen (GER) | 09.06.2019 | S,Q |  | 37.Adrian Ben |  ESP | 1:45.78 | Barcelona (ESP) | 17.07.2019 | S,Q |  |  Outside of Qualifying Standard 1:45.80 - 10 athletes. |  | -. Gabriel Tual |  FRA | 1:45.84 | Paris (FRA) | 24.08.2019 | DNS |   |  | -. Alexis Miellet |  FRA | 1:45.88 | Marseille (FRA) | 02.07.2019 | DNS |   |  | -. Joseph Deng |  AUS | 1:45.98 | Perth (AUS) | 16.03.2019 | DNS |   |  | 38.Lucirio Antonio Garrido |  VEN | 1:46.27 | Lima (PER) | 26.05.2019 | S,AC,Q |  | 39.Pol Moya |  AND | 1:46.96 | Castellón (ESP) | 23.07.2019 | S,BCA,Q |  | 40.Musa Hajdari |  KOS | 1:47.65 | Ohrid (MKD) | 16.06.2019 | S,BCA,Q |  | 41.Mohammed Al-Suleimani |  OMA | 1:51.45 | Doha | 21.04.2019 | S,BCA,Q |  | 42.Mahamat Bachir Ahmat |  CHA | 1:53.46 | Chartres | 02.06.2019 | S,BCA,Q |  | 43.Min Min Zaw |  MYA | 1:55.27 | Nay Pyi Taw | 12.06.2019 | S,BCA,Q |  | 44.Roberto Belo Amaral Soares |  TLS |   |   |   | S,BCA,Q |  | 44.Benjamin Enzema |  GEQ |   |   |   | S,BCA,Q |  | 46.Jamal Al-Hayrani |  QAT | 1:45.90 | Madrid (ESP) | 25.08.2019 | S,q |  | 47.Mark English |  IRL | 1:45.94 | Birmingham (GBR) | 18.08.2019 | S,q |  | 48.Eric Nzikwinkunda |  BDI | 1:45.95 | Andújar (ESP) | 06.09.2019 | q |   |  |  Top 8 not qualified athletes |  | -. Mateusz Borkowski |  POL | 1:46.03 | Bydgoszcz (POL) | 12.06.2019 |   |  | -. Michał Rozmys |  POL | 1:46.03 | Barcelona (ESP) | 17.07.2019 |   |  | -. Mohamed Ahmed Hamada |  EGY | 1:46.05 | Barcelona (ESP) | 17.07.2019 |   |  | -. Mayanja Abu |  UGA | 1:46.11 | Kampala (UGA) | 03.08.2019 |   |  | -. Aymeric Lusine |  FRA | 1:46.18 | Bruxelles (BEL) | 23.08.2019 |   |  | -. Antoine Gakeme |  BDI | 1:46.19 | Hengelo (NED) | 17.07.2019 |   |  | -. Abdirahman Saeed Hassan |  QAT | 1:46.19 | Bern (SUI) | 03.08.2019 |   |  | -. Temam Tura |  ETH | 1:46.24 | Hengelo (NED) | 17.07.2019 |   |  |  Athletes who acieved the entry standard but were not selected |  | -. Timothy Cheruiyot |  KEN | 1:43.11 | Nairobi (KEN) | 22.08.2019 | nS |   |  | -. Wycliffe Kinyamal |  KEN | 1:43.48 | London (GBR) | 20.07.2019 | nS |   |  | -. Michael Saruni |  KEN | 1:43.70 | Monaco (MON) | 12.07.2019 | nS |   |  | -. Marcin Lewandowski |  POL | 1:43.74 | London (GBR) | 20.07.2019 | nS |   |  | -. Cornelius Tuwei |  KEN | 1:43.90 | London (GBR) | 20.07.2019 | nS |   |  | -. Collins Kipruto |  KEN | 1:44.42 | Rovereto (ITA) | 27.08.2019 | nS |   |  | -. Alfred Kipketer |  KEN | 1:44.50 | Madrid (ESP) | 25.08.2019 | nS |   |  | -. Jonathan Kitilit |  KEN | 1:44.50 | Nairobi (KEN) | 22.08.2019 | nS |   |  | -. Craig Engels |  USA | 1:44.68 | Azusa CA (USA) | 09.07.2019 | nS |   |  | -. Devin Dixon |  USA | 1:44.76 | Fayetteville AR (USA) | 11.05.2019 | nS |   |  | -. Edwin Melly |  KEN | 1:45.00 | Gliwice (POL) | 02.06.2019 | nS |   |  | -. Jesus López |  MEX | 1:45.03 | Portland OR (USA) | 19.07.2019 | nS |   |  | -. Festus Lagat |  KEN | 1:45.05 | Austin TX (USA) | 07.06.2019 | nS |   |  | -. Jake Wightman |  GBR | 1:45.08 | Monaco (MON) | 12.07.2019 | nS |   |  | -. Josh Kerr |  GBR | 1:45.35 | Azusa CA (USA) | 09.07.2019 | nS |   |  | -. Max Burgin |  GBR | 1:45.36 | Bedford (GBR) | 23.06.2019 | nS |   |  | -. Kevin López |  ESP | 1:45.38 | Madrid (ESP) | 25.08.2019 | nS |   |  | -. Abel Kipsang |  KEN | 1:45.43 | Rabat (MAR) | 28.08.2019 | nS |   |  | -. Isaiah Harris |  USA | 1:45.55 | Rovereto (ITA) | 27.08.2019 | nS |   |  | -. Thomas Staines |  GBR | 1:45.67 | Nashville TN (USA) | 31.05.2019 | nS |   |  | -. Nicholas Kipkoech |  KEN | 1:45.67 | Nairobi (KEN) | 22.06.2019 | nS |   |  | -. Charlie Da’Vall Grice |  GBR | 1:45.72 | Watford (GBR) | 29.06.2019 | nS |   |  | -. Joshua Ralph |  AUS | 1:45.99 | Perth (AUS) | 16.03.2019 | nS,AC |   |   
 | 
 |  
 |