4x100

U.S. loses appeal of men's 4x100-meter relay team DQ
USA Track & Field's appeal of the men's 4x100-meter relay team's disqualification in Friday's race has been denied, the IAAAF said Saturday.
U.S. women to re-run 4x100-meter relay heat after botched handover
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U.S. women to re-run 4x100-meter relay heat after botched handover