Chelimo took 0.32sec off the record Arturo Barrios, of Mexico, set in Berlin in 1989. He ran the second half of the race alone, encouraged by a crowd of over 17,000, passing the 5,000m mark in 13min 43sec. Barrios was second in 27:34.27, with Britain's Paul Evans, who plans to run the marathon at the world championships, fourth in 27:47.79.
Chelimo missed out on the 10,000 metres world record by three seconds in 1991, and finished second in the world championships.
He finished behind Khalid Skah, of Morocco, in last year's Olympic 10,000m final, was awarded the gold medal after Skah was ruled to have gained unfair advantage through a lapped colleague, Hammou Boutayeb, only to lose it the next day on appeal.
While middle-distance runners have prospered on the Olympic Stadium track over the years, it has been traditionally unrewarding for sprinters. Colin Jackson, seeking a time of around 13 seconds for the 110m hurdles, had to settle for a disappointing 13.45sec and a far closer race than he would have expected with his main domestic rival Tony Jarrett, who finished second in the same time.
At 800m, Tom McKean made little impression on a high quality field, finishing seventh a second behind the winner, Mark Everett, of the United States.
But in the women's 800m, Kelly Holmes underlined her huge potential with a victory in 2min 00.45sec. She is the Army cross-country champion, and has recently run a 52-second 400m relay leg.
Gary Cadogan, racing in only his seventh 400m hurdles race, finished third in 50.67 behind the Olympic champion and world record-holder, Kevin Young, who won in 49.61sec.
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