First 3 in each heat (Q) and the next 6 fastest (q)

First 3 of each heat (Q) plus 6 fastest times (q) qualify to Semi-Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 3 2731 Håvard Bentdal INGVALDSEN NORNOR 44.39 Q NR
2 1 2 2842 Wayde VAN NIEKERK RSARSA 44.57 Q
3 1 1 2060 Steven GARDINER BAHBAH 44.65 Q
4 2 2 2349 Matthew HUDSON-SMITH GBRGBR 44.69 Q SB
5 1 6 2099 Bayapo NDORI BOTBOT 44.72 Q
6 1 5 2558 Antonio WATSON JAMJAM 44.77 Q .766
7 2 1 2589 Kentaro SATO JPNJPN 44.77 Q NR .767
8 3 2 2699 Liemarvin BONEVACIA NEDNED 44.78 Q SB
9 4 2 2097 Busang Collen KEBINATSHIPI BOTBOT 44.80 q PB
10 3 1 2431 Attila MOLNÁR HUNHUN 44.84 Q NR
11 2 5 2989 Quincy HALL USAUSA 44.86 Q
12 2 3 3018 Vernon NORWOOD USAUSA 44.87 Q
13 4 1 2833 Zakithi NENE RSARSA 44.88 q
14 1 4 2413 Kirani JAMES GRNGRN 44.91 Q
15 2 6 2079 Alexander DOOM BELBEL 44.92 Q PB
16 2 4 2588 Fuga SATO JPNJPN 44.97 Q PB
17 3 4 2529 Sean BAILEY JAMJAM 44.98 Q
18 5 1 2646 Michael JOSEPH LCALCA 45.04 q
19 3 6 2530 Zandrion BARNES JAMJAM 45.05 Q
20 4 4 2511 Davide RE ITAITA 45.07 q SB
21 3 5 2582 Yuki Joseph NAKAJIMA JPNJPN 45.15 Q .147
22 3 3 2919 Jereem RICHARDS TTOTTO 45.15 Q .149
23 5 4 2101 Leungo SCOTCH BOTBOT 45.20 q
24 4 3 2073 Dylan BORLÉE BELBEL 45.24 q
25 4 6 2389 Manuel SANDERS GERGER 45.34 .339
25 4 6 2107 Lucas CARVALHO BRABRA 45.34 .339
27 5 3 2956 Oleksandr POHORILKO UKRUKR 45.37
28 6 3 2798 João COELHO PORPOR 45.38
29 5 2 2019 Elián LARREGINA ARGARG 45.42
30 4 5 2834 Lythe PILLAY RSARSA 45.58
31 6 4 2722 Dubem NWACHUKWU NGRNGR 45.60
32 7 4 2216 Gustav Lundholm NIELSEN DENDEN 45.66 PB
33 5 5 2881 Lionel SPITZ SUISUI 45.69
34 6 1 2859 Aruna Dharshana SINGHAPURAGE SRISRI 45.70
35 7 1 2625 Boniface Ontuga MWERESA KENKEN 45.91
36 6 6 2207 Matěj KRSEK CZECZE 45.99
37 7 3 2068 Jonathan JONES BARBAR 46.03
38 7 6 2982 Bryce DEADMON USAUSA 46.20
39 6 5 2793 Karol ZALEWSKI POLPOL 46.53
40 7 5 2477 Christopher O'DONNELL IRLIRL 46.76
41 6 2 2064 Alonzo RUSSELL BAHBAH 46.95
5 2067 Desean BOYCE BARBAR DNF
2 2186 Anthony José ZAMBRANO COLCOL DQ
4 2889 Carl BENGTSTRÖM SWESWE DQ
3 2878 Ricky PETRUCCIANI SUISUI DNS
Legend

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