First 4 in each heat (Q) and the next 4 fastest (q)

First 4 of each heat (Q) plus 4 fastest times (q) qualify to Semi-Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 2 1852 Lythe PILLAY RSARSA 46.02 Q SB
2 2 2 1299 Abbas Yusuf ALI BRNBRN 46.21 Q
3 3 2 1648 Delano KENNEDY JAMJAM 46.24 Q PB
4 1 4 1986 Steven MCELROY USAUSA 46.38 Q
5 1 3 1369 Tadeáš PLAČEK CZECZE 46.56 Q PB
6 1 1 1411 Ángel GONZÁLEZ ESPESP 46.65 Q
7 2 3 1659 Shaemar UTER JAMJAM 46.66 Q
8 1 5 1682 Masataka TOMODA JPNJPN 46.68 Q
9 4 2 1689 Elkanah Kiprotich CHEMELILI KENKEN 46.69 Q
10 5 2 1326 Martin KOUYOUMDJIAN CHICHI 46.75 q PB
11 2 5 1995 Ashton SCHWARTZMAN USAUSA 46.76 Q
12 2 4 1319 Christopher MORALES-WILLIAMS CANCAN 46.81 Q
13 3 4 1772 Andreas GRIMERUD NORNOR 46.85 Q
14 3 3 1408 Markel FERNANDEZ ESPESP 46.87 Q
15 2 1 1270 Busang Collen KEBINATSHIPI BOTBOT 46.89 Q
16 4 4 1859 Tjaart VAN DER WALT RSARSA 47.00 Q
17 3 1 1293 Vinícius MOURA BRABRA 47.02 Q
18 3 5 1924 Joshua ATKINSON THATHA 47.03 Q
19 4 3 1663 Shion ARITA JPNJPN 47.10 Q .092
20 4 1 1314 Tyler FLOYD CANCAN 47.10 Q .094
21 4 5 1350 Marko OREŠKOVIĆ CROCRO 47.12 Q PB
22 6 2 1241 Cooper SHERMAN AUSAUS 47.16 q PB
23 5 5 1515 Lukas KRAPPE GERGER 47.25 q PB
24 5 1 1717 Lukas SUTKUS LTULTU 47.39 q PB
25 6 5 1836 Denis Simon TOMA ROUROU 47.64
26 6 1 1758 Bamidele AJAYI NGRNGR 47.67
27 5 4 1364 Michal HAIDELMEIER CZECZE 47.70
28 7 1 1834 Remus Andrei NICULITA ROUROU 47.80
29 5 3 1962 Emmanuel RWOTOMIYA UGAUGA 47.86
30 7 5 1632 Luca SITO ITAITA 48.03
31 7 2 2013 Amal GLASGOW VINVIN 48.26
32 6 3 1787 Lex REVELL-LEWIS NZLNZL 48.66
33 6 4 1269 Tumiso GABONAMONG BOTBOT 48.72
34 7 3 1296 Joao Henrrique RIBEIRO BARROS BRABRA 48.73
4 2019 Joshua MPANZA ZAMZAM DQ
Legend

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