First 2 in each heat (Q)

First 2 of each heat (OQ) qualify to Olympic Games and World Athletics Relays Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 1 USA United States USAUSA 37.49 OQ WL
2 1 4 JPN Japan JPNJPN 38.10 OQ SB
3 1 3 CAN Canada CANCAN 38.11 OQ SB
4 2 1 ITA Italy ITAITA 38.14 OQ SB
5 2 4 CHN PR of China CHNCHN 38.25 OQ SB
6 1 2 FRA France FRAFRA 38.32 OQ SB
7 2 2 GBR Great Britain & NI GBRGBR 38.36 OQ SB
8 3 2 TTO Trinidad and Tobago TTOTTO 38.46 SB
9 4 2 NGR Nigeria NGRNGR 38.47
10 2 3 JAM Jamaica JAMJAM 38.50 OQ SB .492
11 3 3 AUS Australia AUSAUS 38.50 .496
12 5 2 SUI Switzerland SUISUI 38.55 SB
13 3 1 BRA Brazil BRABRA 38.79 SB
14 3 4 RSA South Africa RSARSA 38.83 SB
15 4 3 THA Thailand THATHA 38.87 .861
16 5 3 NED Netherlands NEDNED 38.87 .867
16 6 2 POL Poland POLPOL 38.87 SB .867
18 4 4 CUB Cuba CUBCUB 39.00
19 4 1 LBR Liberia LBRLBR 39.07
20 5 4 DOM Dominican Republic DOMDOM 39.08 =SB
21 6 4 KSA Saudi Arabia KSAKSA 39.18 =SB
22 7 4 COL Colombia COLCOL 39.20
23 5 1 KOR Korea KORKOR 39.25 SB
24 6 1 BAH Bahamas BAHBAH 39.27 SB
25 7 1 CZE Czech Republic CZECZE 39.31 SB
26 7 2 ESP Spain ESPESP 39.35 SB
27 8 4 KEN Kenya KENKEN 39.38
28 6 3 DEN Denmark DENDEN 39.82
29 8 2 TUR Türkiye TURTUR 40.04 SB
3 GER Germany GERGER DNF
3 BEL Belgium BELBEL DQ
1 GHA Ghana GHAGHA DQ
Legend

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