Britain's Helen Clitheroe won her second 1500m in two days at the PSD Bank International indoor meeting in Dusseldorf on Tuesday.
Clitheroe also won the indoor 1500m race in Ghent on Monday
Clitheroe won in four minutes 08.58 seconds, to beat the world-leading time of 4:09.28 she set in Ghent on Monday.
Slovenian Sonja Roman led going into the final lap but could not respond as Clitheroe produced a sprint finish.
Sarah Claxton finished seventh in the 60m hurdles in 8.17 seconds, victory going to Lolo Jones of the USA in 7.97.