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 2106 Busang Collen KEBINATSHIPI BOTBOT 43.61 Q WL
2 2 2 2562 Rusheen MCDONALD JAMJAM 44.04 Q SB
3 3 2 2932 Jereem RICHARDS TTOTTO 44.12 q SB
4 4 2 3029 Jacory PATTERSON USAUSA 44.19 q
5 1 1 2867 Zakithi NENE RSARSA 44.20 Q
6 1 3 2108 Bayapo NDORI BOTBOT 44.21 Q SB
7 2 1 2104 Lee Bhekempilo EPPIE BOTBOT 44.51 Q
8 2 3 2606 Yuki Joseph NAKAJIMA JPNJPN 44.53 Q
9 3 3 3063 Muzala SAMUKONGA ZAMZAM 44.60
10 3 1 2035 Reece HOLDER AUSAUS 44.63
11 4 1 2846 Ammar Ismail YAHIA IBRAHIM QATQAT 44.74
12 5 2 2531 Edoardo SCOTTI ITAITA 44.77
13 4 3 3021 Khaleb MCRAE USAUSA 44.82 .814
14 6 2 2870 Lythe PILLAY RSARSA 44.82 .816
15 5 3 3027 Vernon NORWOOD USAUSA 44.83
16 7 2 2370 Charles DOBSON GBRGBR 44.85
17 5 1 2463 Attila MOLNÁR HUNHUN 44.94
18 6 3 2379 Matthew HUDSON-SMITH GBRGBR 44.95
19 7 3 2558 Delano KENNEDY JAMJAM 44.97 .970
19 7 3 2453 Kirani JAMES GRNGRN 44.97 .970
21 6 1 2564 Bovel MCPHERSON JAMJAM 44.99
22 7 1 2972 Christopher BAILEY USAUSA 45.05
23 8 1 2389 Samuel REARDON GBRGBR 45.10
24 8 2 2891 Rok FERLAN SLOSLO 45.71
Legend

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