Ethiopian runner Genzebe Dibaba set her third world record of the month in winning over two miles at the Birmingham Grand Prix on Saturday.
Dibaba eased over the line in 9 minutes 0.48 seconds indoors in central England, breaking her compatriot Meseret Defar's mark from 2009 by almost six seconds.
Dibaba had already broken the indoor 1,500 and 3,000-metre records this month in the run-up to the world indoor championships next month in Sopot, Poland.
British sprinter James Dasaolu will be hoping he is fit for the championships after appearing to injure himself while upstaging Nesta Carter of Jamaica to win the 60 metres.
Dasaolu left the Birmingham track on a wheelchair with an ice pack on his left hamstring.
"My left leg felt tight at about 40-50 metres," he said, "I think it's cramp, but I'll go and see the doctors and see what they say."
It is a potential blow for Dasaolu, who won his heat in 6.47 seconds - the fastest time this year, before winning the final in 6.50 seconds. That was 0.03 seconds ahead of Carter, while Kim Collins of St. Kitts and Nevis was third followed by British sprinter Dwain Chambers.
The women's race produced an upset, with double Olympic 100-metre champion Shelly-Ann Fraser-Pryce of Jamaica having to settle for second place as Murielle Ahoure of the United States emerged victorious.
In the men's 800, world champion Mohammed Aman broke the Ethiopian indoor record in 1.44.53 seconds, while Pascal Martinot-Lagard of France won the 60 hurdles in 7.55, Erik Kynard of the United States cleared 2.34 metres to win the high jump, and Aleksandr Menkov leapt furthest in the long jump - 8.14 metres.
