First 2 in each heat (Q)

First 2 of each heat qualify to World Athletics Championships (WQ) and World Athletics Relays Final

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 2 RSA South Africa RSARSA 37.84 WQ WL .834
2 1 3 JPN Japan JPNJPN 37.84 WQ =WL .840
3 1 4 USA United States USAUSA 37.86 WQ SB
4 2 3 CAN Canada CANCAN 38.15 WQ
5 2 4 ITA Italy ITAITA 38.16 WQ SB
6 1 1 GBR Great Britain & NI GBRGBR 38.18 WQ SB
7 3 3 NED Netherlands NEDNED 38.20 SB
8 3 4 CHN PR of China CHNCHN 38.30 SB
9 2 2 GER Germany GERGER 38.33 WQ SB .326
10 4 3 AUS Australia AUSAUS 38.33 .327
11 3 2 KEN Kenya KENKEN 38.35 NR
12 4 4 BRA Brazil BRABRA 38.40 SB
13 2 1 POL Poland POLPOL 38.43 WQ SB
14 5 4 BOT Botswana BOTBOT 38.49 NR .483
15 3 1 GHA Ghana GHAGHA 38.49 SB .487
16 4 1 KOR Korea KORKOR 38.56 NR
17 5 1 FRA France FRAFRA 38.62 SB
18 6 1 COL Colombia COLCOL 38.75
19 5 3 SUI Switzerland SUISUI 38.95 SB
20 4 2 TPE Chinese Taipei TPETPE 39.00 SB
21 6 3 DEN Denmark DENDEN 39.08 SB
22 5 2 THA Thailand THATHA 39.18 SB
23 6 4 PAR Paraguay PARPAR 39.53 SB
24 7 4 ESP Spain ESPESP 39.66 SB
2 JAM Jamaica JAMJAM DNF
2 BEL Belgium BELBEL DQ
Legend

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