USA celebrate their world record in the distance medley at the IAAF/BTC World Relays, Bahamas 2015 (© Getty Images)
The following world records have recently been ratified...
Distance medley relay: 9:15.50 United States (Kyle Merber, Brycen Spratling, Brandon Johnson, Ben Blankenship) Nassau, BAH 2 May 15
Previous best: 9:15.56 Kenya (Elkanah Angwenyi, Thomas Musembi, Alfred Kirwa Yego, Alex Kipchirchir Rono) Philadelphia, USA 29 Apr 06
Distance medley relay: 10:36.50 United States (Treniere Moser, Sanya Richards-Ross, Ajee Wilson, Shannon Rowbury) Nassau, BAH 3 May 15
Previous best: 10:42.57i United States (Sarah Brown, Mahagony Jones, Megan Krumpoch, Brenda Martinez) Boston, USA 7 Feb 15
20km race walk: 1:24:38 Hong Liu (CHN) La Coruna, ESP 6 Jun 15
Previous: 1:25:02 Elena Lashmanova (RUS) London, GBR 11 Aug 2012