American Bernard Lagat made a blistering kick to crush the US record in his first indoor 5,000 metres, finishing in 13:11.50 at the 15th Boston Indoor Games on Saturday.
Ethiopia's double Olympic champion Tirunesh Dibaba was 20 seconds off the world record in the women's 5,000m but her 14:44.53 was easily the year's fastest.
Olympic 1,500m silver medallist Nick Willis, of New Zealand, launched his comeback from 2009 surgery with the fastest mile of 2010, 3:55.26, to pip Americans Will Leer and David Torrance.
Lagat, a former double world champion at 1,500 and 5,000, sliced almost seven seconds off the record set in 2009 by Galen Rupp.
He surged to the front with 300m to go and held off Ethiopians Dejen Gebremeskel and Bekana Daba with matching 13:11.78 times. Rupp finished fourth in 13:14.21, a new personal best.