U.S. women disqualified from 4x400m relay after baton fail

Rio latest: US women win 4x100-meter relay gold; men disqualified

Jamaica's Broadbell out of sprint hurdles after fall in heats

Olympics 2021: US men's 4x100 relay fails to qualify for event final

Pinnock flies to a world-leading distance in long jump qualifying

U.S. women add 4x400 relay to Olympic gold rush

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British pole vaulter Bradshaw out of World Championships

England are DISQUALIFIED from women's 4x400m relay at Commonwealth Games

Olympics 2012 — U.S. Track Relays Hope to Avoid Another Baton Drop - The New York Times

Olympics: USA mixed 4x400m relay controversially DQ'd - Yahoo Sports