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The athlete broke down in tears after she got off her bike.
Bruce Springsteen's daughter and her teammates Laura Kraut and McLain Ward lost a jump-off for the gold medal to Sweden.
The veteran stars uncorked vintage performances in the 4-3 victory over Australia.
The U.S. men's relay team beat the world record by .5 seconds, finishing in 3:26.78.
The 18-year-old is the first Hmong American to win a gold medal at the Summer Games.
The underdog Team USA swimmer spent much of the race in the middle of the pack, but blazed home to win.
"This team is blah," one Twitter user wrote. "No drive or determination to win."
Momiji Nishiya of Japan won the women's street competition. The other medal winners in the event were 13 and 16.