Tirunesh Dibaba devastated the field to clock the second-fastest indoor 5,000m of all-time at the Boston Indoor Games.
Tirunesh Dibaba (right) led home her sister Ejegayehu
The Ethiopian world 5,000m and 10,000m champion won the race in 14 minutes 35.46 seconds - a massive 43 seconds ahead of her older sister Ejegayehu.
Dibaba had been trying to beat her own world record of 14:32.93.
Ireland's Alistair Cragg showed he is coming into form as he took third behind Craig Mottram and Sileshi Sihine in the men's two-mile race.
Cragg had paced the high-quality field for most of the race but was passed with 200m to go as Australia's Mottram won in 8.26:54.
"I wanted to control things the last lap because it's really hard to overtake," said Cragg.
"I relaxed for a step and the two of them caught me."
Meseret Defar just missed out on smashing Berhane Adere's world record as she won the women's 3,000m.
The Ethiopian clocked 8:30.05 and revealed afterwards she had lost her timing during the race.
American Terrence Trammell quickly overhauled Jason Gardener's world-leading mark in the 60m set in Glasgow as he won the Boston race in 6.57 seconds.