First 2 in each heat (Q) and the next 2 fastest (q)

First 2 of each heat (Q) plus 2 fastest times (q) qualify to Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 2 2491 Cian MCPHILLIPS IRLIRL 1:43.18 Q NR .174
2 1 3 2271 Mohamed ATTAOUI ESPESP 1:43.18 Q .179
3 2 2 2363 Max BURGIN GBRGBR 1:43.37 Q
4 2 3 2662 Emmanuel WANYONYI KENKEN 1:43.47 Q
5 3 3 2546 Navasky ANDERSON JAMJAM 1:43.72 q NR
6 4 3 2107 Tshepiso MASALELA BOTBOT 1:43.80 q
7 3 2 2980 Donavan BRAZIER USAUSA 1:43.82
8 4 2 2527 Francesco PERNICI ITAITA 1:43.84 PB
9 5 3 3004 Bryce HOPPEL USAUSA 1:43.92
10 5 2 2356 Gabriel TUAL FRAFRA 1:44.09
11 6 3 2345 Yanis MEZIANE FRAFRA 1:44.12
12 6 2 2272 David BARROSO ESPESP 1:44.27
13 7 3 2224 Marino BLOUDEK CROCRO 1:44.33
14 8 3 2080 Eliott CRESTAN BELBEL 1:44.56
15 7 2 2647 Kelvin Kimtai LOTI KENKEN 1:44.82
16 1 1 2147 Marco AROP CANCAN 1:45.09 Q .085
17 2 1 2007 Djamel SEDJATI ALGALG 1:45.09 Q .088
18 3 1 2482 Mark ENGLISH IRLIRL 1:45.47
19 4 1 2811 Maciej WYDERKA POLPOL 1:45.55
20 5 1 2387 Ben PATTISON GBRGBR 1:45.84
21 6 1 2105 Kethobogile HAINGURA BOTBOT 1:46.05
22 7 1 2573 Tyrice TAYLOR JAMJAM 1:46.56
23 8 2 2006 Slimane MOULA ALGALG 1:46.82
24 8 1 2632 Nicholas Kiplangat KEBENEI KENKEN 1:49.54
Legend

ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second