4x100m dq2 The United States team of Mickey Grimes, Bernard Williams, Dennis Mitchell and Tim Montgomery originally won the 2001 World Championship in a time of 37.96 seconds, but were disqualified after Montgomery admitted to drug use as a result of the BALCO scandal in 2005.
Note: * Indicates athletes who ran only in the preliminary round and also received medals.
dq1 The United States team (Jerome Young, Antonio Pettigrew, Chris Jones and Tyree Washington) originally won the 1997 World Championships in a time of 2:56.47 minutes, but was disqualified in 2009 after Pettigrew admitted to doping during the period.
dq3 The United States team (Leonard Byrd, Antonio Pettigrew, Derrick Brew and Angelo Taylor) originally won the 2001 World Championships, but was disqualified in 2009 after Pettigrew admitted to doping during the period.
dq4 The United States team (Calvin Harrison, Tyree Washington, Derrick Brew and Jerome Young) originally won the 2003 World Championships, but was disqualified in 2004 after Harrison and Young were found to have used performance-enhancing drugs.
dq5 The Russian team (Maksim Dyldin, Lev Mosin, Sergey Petukhov and Vladimir Krasnov) originally finished third in the 2013 World Championships, but was disqualified after Dyldin was found to have used performance-enhancing drugs.
