First 2 in each heat (Q) and the next 2 fastest (q)

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

POS Rank Heat BIB ATHLETE COUNTRY RESULTS ms*
1 1 2 CAN Canada CANCAN 37.56 WQ WL
2 2 2 GER Germany GERGER 37.67 WQ NR
3 1 3 RSA South Africa RSARSA 37.68 WQ SB
4 1 1 USA United States USAUSA 37.77 WQ WL
5 3 2 AUS Australia AUSAUS 37.87 Wq =AR
6 2 1 BOT Botswana BOTBOT 37.96 WQ NR
7 3 1 NED Netherlands NEDNED 38.00 Wq SB
8 4 1 JPN Japan JPNJPN 38.01 SB .002
9 2 3 GBR Great Britain & NI GBRGBR 38.01 WQ SB .009
10 3 3 CHN PR of China CHNCHN 38.02 SB
11 4 2 JAM Jamaica JAMJAM 38.08 SB
12 4 3 GHA Ghana GHAGHA 38.19 SB
13 5 3 NGR Nigeria NGRNGR 38.31 SB
14 5 2 KEN Kenya KENKEN 38.50 SB
15 6 3 BRA Brazil BRABRA 38.61 SB
16 5 1 ITA Italy ITAITA 38.74 SB
17 6 2 ESP Spain ESPESP 38.80 SB
18 7 3 POL Poland POLPOL 38.91 SB
19 6 1 FRA France FRAFRA 38.97 SB
20 8 3 IND India INDIND 39.07 SB
21 7 1 COL Colombia COLCOL 40.86 SB
2 BEL Belgium BELBEL DNF
Legend

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