2016 Olympics, track and field results: Allyson Felix wins 6th gold medal with 4x400 relay win

The men's and women's teams won gold in the 4x400, plus Matthew Centrowitz won the first gold for the US since 1908 in the 1500 meters.

Rio 2016: Allyson Felix hits gold record as US women win 4x400 relay

Allyson Felix Wins 11th Olympic Medal – NBC Los Angeles

Sprint legend Felix, leaving a legacy on and off the track, FEATURE

Rio Olympics 2016: US women win 4×400 relay, Felix's 6th gold

Allyson Felix - Wikipedia

U.S. women win sixth consecutive 4×400-meter relay, Allyson Felix wins record sixth gold medal - The Washington Post

Track and field in review: Felix wins medal No. 11, 400m hurdles records obliterated

Allyson Felix - Wikipedia

2016 Olympics, track and field results: Allyson Felix wins 6th gold medal with 4x400 relay win

Allyson felix usa hi-res stock photography and images - Alamy

Track and field in better place after 2016 Rio Olympics - Sports Illustrated

Team USA wins 6th straight Olympic gold in women's 4x400m relay