IN the final women’s event of the IAAF Championships, the United States won 4x400m gold in 3:18.92, thereby adding another world gold to the record total collected by Allyson Felix.

Although Felix – who moved one clear of the record of 11 she held jointly with Usain Bolt as a member of the quartet that set a mixed 4x400m relay world record on day three – did not run on Sunday night she was eligible for another gold having run in the heats. So 13 golds she now has…

The 2017 individual champion Phyllis Francis ran strongly to set up 20-year-old 400m hurdles phenomenon Sydney McLaughlin, who handed over to the woman who had to run another world record to beat her in the individual final, Dalilah Muhammad, before the baton was brought home with 10 metres to spare by Wadeline Jonathas.

There were soon shrieks of disbelief from the silver medallist Polish runners as they saw the national record time of 3:21.89 on the scoreboard after European champion Justyna Swiety-Ersetic had regained her lead over Jamaica’s individual bronze medallist Shericka Jackson 50m from home.

Jamaica took bronze in 3:22.37 ahead of Britain, who clocked 3:24.99.

In the concluding event, the men’s 4x400m title went to the United States as anchor leg runner Rai Benjamin brought the baton home in 2:56.69, the fastest time run this season, with Jamaica taking silver in 2:57.90.

Kevin Borlee held off the challenge of individual silver medallist Anthony Zambrano to secure bronze for Belgium in 2:58.78, with Colombia finishing fourth in a national record of 2:59.50. (Mike Rowbottom for the IAAF).