​UPDATE: ​The quartet of Tianna Bartoletta, Allyson Felix, English Gardner, and Morolake Akinosun ran 41.77 in a solo re-run in lane two. That's the fastest time of any qualifiers, and bumps China out of the final. China had the same time as Canada in 42.70, but ran thousandths slower than the Canadians. The unprecedented re-run came after a Brazilian runner bumped Felix in the prelims just steps before she was going to hand off to Gardner. Our original story appears below.

The U.S. women failed to get the baton around the track in the preliminaries of the 4x100m relay, but will be given another chance for a spot in the final.



Allyson Felix and English Gardner botched the second exchange and dropped the baton. Felix said she felt contact from an athlete on the Brazil team in the lane next to her. The U.S. team filed a protest and Brazil was disqualified.

The U.S. will run a time trial at 5:00PM CST and must run faster than 42.70 to advance to the finals. Canada and China both recorded 42.70 in the prelims, and China is listed as the eighth qualifier, one one-thousandth slower than Canada.

China has filed a protest against the re-run decision.

A dropped baton isn't out of the ordinary for Team USA. Charts don't lie:

Year	Meet	Event	Team	What happened	Who was involved
2016	Olympics (Rio)	W 4x100m	USA	Botched exchange	Allyson Felix to English Gardner
2015	World Championships (Beijing)	M 4x100m	USA	DQ in final (3rd exchange out of zone)	Tyson Gay to Mike Rodgers
2015	World Relays	W 4x200m	USA	DNF	Jeneba Tarmoh to Allyson Felix exchange
2015	World Relays	M 4x200m	USA	DQ in final (2nd to 3rd exchange out of zone)	Isiah Young to Curtis Mitchell, dropped baton
2014	World Relays	W 4x1500m	USA	2nd leg falls down after collision with AUS at exchange	Katie Mackey
2014	World Relays	M 4x100m	USA	DQ in heats (2nd to 3rd exchange out of zone)	Trell Kimmons to Rakieem Salaam
2014	World Relays	M 4x200m	USA	DQ in final (2nd to 3rd exchange out of zone)	Curtis Mitchell to Ameer Webb
2013	World Championships (Moscow)	M 4x100m	USA	Silver medal (3rd exchange outside lane, no DQ)	Mookie Salaam to Justin Gatlin
2011	World Championships (Daegu)	M 4x100m	USA	DNF	Darvis "Doc" Patton crash with Harry Aikines-Aryeetey (GBR)
2009	World Championships (Berlin)	W 4x100m	USA	DNF in heats	Alexandria Anderson to Muna Lee (Lee injury)
2009	World Championships (Berlin)	M 4x100m	USA	DQ in rounds	Darvis "Doc" Patton to Shawn Crawford
2008	Olympics (Beijing)	M 4x100m	USA	DNF	Darvis "Doc" Patton to Tyson Gay
2008	Olympics (Beijing)	W 4x100m	USA	DQ in heats	Torri Edwards to Lauryn Williams
2005	World Championships (Helsinki)	M 4x100m	USA	DNF in rounds	First exchange (Mardy Scales to Leonard Scott)
2004	Olympics (Athens)	W 4x100m	USA	DQ	Marion Jones to Lauryn Williams: pass out of zone
2001	World Championships (Edmonton)	M 4x100m	USA	Retroactive DQ (Doping)	Tim Montgomery
2001	World Championships (Edmonton)	W 4x100m	USA	Retroactive DQ (Doping)	Marion Jones

The U.S. squad of Mike Rodgers, Christian Coleman, Tyson Gay and Jarrion Lawson won their preliminary heat in 37.65, the fastest time of the morning.

Though a country can run an entirely different squad in the final, we know that our top runners, Trayvon Bromell and Justin Gatlin, are banged up. 

Women

Auto Qualifiers:
41.79 Jamaica
41.93 Great Britain
42.18 Germany
42.49 Ukraine
42.55 Nigeria
43.62 Trinidad and Tobago

Time Qualifiers:
42.70 Canada
42.70 China

Men

Auto Qualifiers:
37.65 USA (Mike Rodgers, Christian Coleman, Tyson Gay, Jarrion Lawson)
37.68 Japan
37.82 China
37.89 Canada
37.94 Jamaica
37.96 Trinidad and Tobago

Time Qualifiers:
38.06 Great Britain
38.19 Brazil

The finals of the 4x100m relay will take place Friday, August 19 at 8:15PM, 8:35PM CST.