to break 38 seconds. The current men's world record stands at 36.84, set by the Jamaican team at the final of the 2012 London Olympic Games on 11 August 2012. As the only team to break 37 seconds to date, Jamaica has been the dominant team in the sport, winning two consecutive Olympic Gold Medals and four consecutive World Championships. The Jamaican team also set the previous record of 37.04 seconds at the 2011 World Championships. The fastest electronically timed anchor leg run is 8.65 seconds by Usain Bolt at the 2015 IAAF World Relays, while Bob Hayes was hand-timed as running 8.7 seconds on a cinder track in the 1964 Tokyo Games Final. The Tokyo Games also had electronic timing. High-speed modern video analysis shows his time to be a more realistic 8.95-9.0 seconds in the final, a much more consistent time relative to his Fully Automatic Timing 10.06s 100m world record and more in line with the usual +0.25s-0.3s hand time to FAT conversion. The women's world record stands at 40.82 seconds, set by the United States in 2012 at the London Olympics. The fastest anchor leg run by a woman was run by Christine Arron of France, timed unofficially at 9.67s. According to the IAAF rules, world records in relays can only be set if all team members have the same nationality. Continental records Updated 5 October 2019 All-time top 10 by country Key to tables: X = annulled due to doping violation Men Correct as of June 2022 Women Correct as of August 2021 All-time top 25 Men Updated July 2022 Note: A USA team ran 37.04 in London in 2012 but the performance was annulled due to use of performance-enhancing drugs by Tyson Gay A Jamaican team ran 37.10 in Beijing in 2008 but the performance was annulled due to use of performance-enhancing drugs by Nesta Carter A USA team ran 37.38 in the heats in London in 2012 but the performance was retrospectively disqualified following drug test failure by Tyson Gay, even though Gay only ran in the final and not the heat. A UK team ran 37.51 in Tokyo in 2021 but the performance was annulled due to use of performance-enhancing drugs by Chijindu Ujah Women Correct as of July 2022 Olympic Games medalists Men Women World Championships medalists Men Women See also Men's 4 × 100 metres relay world record progression Women's