Ethiopian Kenenisa Bekele broke his second world record in nine days when he shattered compatriot Haile Gebrselassie's 10,000m mark.
Bekele broke Gebrselassie's six-year record
The 22-year-old double world cross country champion clocked 26 minutes 20.31 seconds at the IAAF Super Grand Prix meeting in Ostrava.
He was well inside Gebrselassie's time of 26:22.75 set at Hengelo in the Netherlands six years ago.
On 31 May, Bekele broke Gebrselassie's 5,000m record at the Hengelo meeting.
"I'm very happy," Bekele said. "I knew I would break
the world record only in the last lap.
"The pacemakers did a good job today."
Bekele said he would prefer to run the 10,000m to the 5,000m at this summer's Olympics in Athens, Greece.