| POS | BIB | ATHLETE | COUNTRY | MARK | 
|---|---|---|---|---|
| 1 | 1244 | Adam KSZCZOT |  POL | 1:46.24 Q | 
| 2 | 707 | Nijel AMOS |  BOT | 1:46.29 Q | 
| 3 | 1145 | Ferguson Cheruiyot ROTICH |  KEN | 1:46.49 | 
| 4 | 1399 | Isaiah HARRIS |  USA | 1:46.66 | 
| 5 | 967 | Guy LEARMONTH |  GBR | 1:46.75 | 
| 6 | 957 | Elliot GILES |  GBR | 1:46.95 | 
| 7 | 1336 | Abdessalem AYOUNI |  TUN | 1:47.39 | 
| 8 | 872 | Kevin LÓPEZ |  ESP | 1:47.62 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 400m | 52.98 |  Ferguson Cheruiyot ROTICH |  KEN | 
| POS | BIB | ATHLETE | COUNTRY | MARK | 
|---|---|---|---|---|
| 1 | 760 | Brandon MCBRIDE |  CAN | 1:45.53 Q | 
| 2 | 966 | Kyle LANGFORD |  GBR | 1:45.81 Q | 
| 3 | 1245 | Marcin LEWANDOWSKI |  POL | 1:45.93 | 
| 4 | 1138 | Emmanuel Kipkurui KORIR |  KEN | 1:46.08 | 
| 5 | 1447 | Drew Windle |  USA | 1:46.33 | 
| 6 | 1160 | Ebrahim ALZOFAIRI |  KUW | 1:46.68 | 
| 7 | 684 | Antoine Gakeme |  BDI | 1:47.08 | 
| 1202 | Thijmen KUPERS |  NED | DNS | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 400m | 50.85 |  Brandon MCBRIDE |  CAN | 
| POS | BIB | ATHLETE | COUNTRY | MARK | 
|---|---|---|---|---|
| 1 | 1126 | Kipyegon Bett |  KEN | 1:45.02 Q | 
| 2 | 892 | Mohammed Aman |  ETH | 1:45.40 Q SB | 
| 3 | 919 | Pierre-Ambroise BOSSE |  FRA | 1:45.63 q | 
| 4 | 713 | Thiago ANDRÉ |  BRA | 1:45.83 q | 
| 5 | 1250 | Michał ROZMYS |  POL | 1:46.10 | 
| 6 | 1307 | Andreas KRAMER |  SWE | 1:46.25 | 
| 7 | 1379 | Donavan BRAZIER |  USA | 1:46.27 | 
| 8 | 864 | Álvaro DE ARRIBA |  ESP | 1:46.64 | 
| Split | Mark | Athlete | COUNTRY | 
|---|---|---|---|
| 400m | 51.51 |  Kipyegon BETT |  KEN |