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 1 2845 Abderrahman SAMBA QATQAT 48.03 Q
2 1 4 2977 Rai BENJAMIN USAUSA 48.15 Q .143
3 1 3 2127 Matheus LIMA BRABRA 48.15 Q .150
4 2 1 2371 Tyri DONOVAN GBRGBR 48.26 Q PB
5 3 1 3031 Chris ROBINSON USAUSA 48.27 Q .263
6 4 1 2557 Malik JAMES-KING JAMJAM 48.27 Q SB .267
7 5 1 2650 Wiseman Were MUKHOBE KENKEN 48.27 q PB .269
8 2 4 2397 Emil AGYEKUM GERGER 48.33 Q
9 2 3 2835 Ismail Doudai ABAKAR QATQAT 48.34 Q
10 1 5 2749 Ezekiel NATHANIEL NGRNGR 48.37 Q
11 1 2 2842 Bassem HEMEIDA QATQAT 48.43 Q
12 2 2 2121 Alison DOS SANTOS BRABRA 48.48 Q
13 6 1 2915 Oskar EDLUND SWESWE 48.52 q PB
14 3 4 2110 Victor NTWENG BOTBOT 48.54 Q PB
15 3 3 2769 Karsten WARHOLM NORNOR 48.56 Q
16 2 5 2989 Caleb DEAN USAUSA 48.67 Q
17 4 3 2936 Berke AKÇAM TURTUR 48.68 Q SB
18 3 5 2120 Francisco Guilherme DOS REIS VIANA BRABRA 48.69 Q PB
19 5 3 2114 Kemorena TISANG BOTBOT 48.72 q
20 4 4 2223 Gerald DRUMMOND CRCCRC 48.81 Q SB .805
21 3 2 2409 Owe FISCHER-BREIHOLZ GERGER 48.81 Q .808
22 5 4 2551 Roshawn CLARKE JAMJAM 48.83 q
23 4 5 2365 Alastair CHALMERS GBRGBR 48.86 Q
24 4 2 2892 Matic Ian GUÄŒEK SLOSLO 48.92 Q
25 7 1 2276 Jesús David DELGADO ESPESP 48.98
26 6 4 2242 Vít MÜLLER CZECZE 49.02
27 7 4 2369 Seamus DERBYSHIRE GBRGBR 49.20
28 8 4 2256 Dennick LUKE DMADMA 49.32
29 6 3 2396 Joshua ABUAKU GERGER 49.41
30 5 5 2854 Sabelo DHLAMINI RSARSA 49.50
31 9 4 2898 Julien BONVIN SUISUI 49.53
32 6 5 2939 İsmail NEZIR TURTUR 49.66
33 8 1 2592 Shunta INOUE JPNJPN 49.73
34 7 3 2911 Carl BENGTSTRÖM SWESWE 49.74
35 5 2 2545 Kyron MCMASTER IVBIVB 49.89
36 8 3 2579 Assinie WILSON JAMJAM 49.91 .901
37 7 5 2908 Patrik DÖMÖTÖR SVKSVK 49.91 .903
38 6 2 2609 Daiki OGAWA JPNJPN 50.08
39 9 3 2888 Jun Jie Calvin QUEK SGPSGP 50.17
40 7 2 2676 Marc Anthony IBRAHIM LBNLBN 50.20
41 8 5 2620 Ken TOYODA JPNJPN 51.80
42 9 5 2070 Najimul Hossain RONI BANBAN 52.47
43 9 1 2686 Chi Chong CHEONG MACMAC 52.76
44 8 2 2889 Akanye FRANCIS SKNSKN 53.26
2 2532 Alessandro SIBILIO ITAITA DNF
Legend

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