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 42.21 OQ
2 1 4 GBR Great Britain & NI GBRGBR 42.33 OQ SB
3 1 3 GER Germany GERGER 42.72 OQ SB
4 1 2 POL Poland POLPOL 42.81 OQ SB
5 2 3 AUS Australia AUSAUS 42.83 OQ AR .822
6 3 3 CIV Côte d’Ivoire CIVCIV 42.83 SB .825
7 4 3 ESP Spain ESPESP 42.85 SB
8 2 4 NED Netherlands NEDNED 42.88 OQ SB
9 2 2 CAN Canada CANCAN 42.98 OQ SB
10 3 2 CHN PR of China CHNCHN 43.03 SB
11 4 2 ITA Italy ITAITA 43.08 SB
12 2 1 FRA France FRAFRA 43.09 OQ
13 3 4 LBR Liberia LBRLBR 43.15 NR .145
14 3 1 NGR Nigeria NGRNGR 43.15 .149
15 4 4 BAH Bahamas BAHBAH 43.17 SB
16 5 4 TTO Trinidad and Tobago TTOTTO 43.22 SB
17 4 1 SUI Switzerland SUISUI 43.29
18 5 2 JAM Jamaica JAMJAM 43.33 SB
19 6 4 HUN Hungary HUNHUN 43.66 SB
20 5 3 ECU Ecuador ECUECU 43.67 NR
21 5 1 BRA Brazil BRABRA 43.82 SB
22 6 1 COL Colombia COLCOL 44.12 SB
23 7 1 JPN Japan JPNJPN 44.16 SB
24 6 3 CHI Chile CHICHI 44.31 SB
25 7 4 AUT Austria AUTAUT 44.49 SB
26 6 2 DOM Dominican Republic DOMDOM 44.72 SB
27 7 3 EST Estonia ESTEST 44.81
28 7 2 DEN Denmark DENDEN 45.03 SB
4 CUB Cuba CUBCUB DNF
3 BEL Belgium BELBEL DQ
Legend

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