Yaroslava Mahuchikh of Ukraine won the displaced women's high jump event at the Prefontaine Classic ©Getty Images

The Prefontaine Classic meeting's traditional Friday night distance races, supplemented this year by three fugitive field events from Saturday’s Wanda Diamond League meeting in Eugene, Oregon following forecasts of rain and high winds, failed to produce any hoped-for world records.

But there were eye-catching wins at Hayward Field for Tokyo 2020 champion Joshua Cheptegei in the men’s 5000 metres, an unexpected defeat for Ethiopia’s world 5,000 and 10,000m record holder Letesenbet Gidey and a win over two miles from Burundi’s Francine Niyonsaba that put the world's best under serious threat.

Ukraine’s world silver medallist and Olympic bronze medallist Yaroslava Mahuchikh teetered on the brink of failure in the women’s high jump after requiring three efforts to clear 1.93 metres.

However the 20-year-old, who fled bombardment in her native town of Dnipro before spending three days getting to Belgrade and winning the world indoor title in March, then won the competition with a first-time clearance of 1.96m before going over at 2.00m.

Her closest challengers were home jumper Vashti Cunningham and Kazakhstan’s Nadezhda Dubovitskaya, who both cleared 1.93m.

Olympic champion and world record holder Mondo Duplantis, as expected, won the men’s pole vault - although on this occasion, unexpectedly, he remained inside 6.00m territory, a clearance of 5.91m proving sufficient for him before three unsuccessful attempts at 6.07m in the re-built arena that will host this summer's World Athletics Championships.

Duplantis was, as also expected, pushed hard by the vaulter who beat him during their US College years, Chris Nilsen, the Tokyo 2020 silver medallist, who finished second with a clearance of 5.81m.

That height was also cleared by third-placed Norwegian Sondre Guttormsen, who thus equalled the national record.

France’s former world record holder Renaud Lavillenie had a first-time clearance of 5.41m but could go no higher.

Home discus thrower Valarie Allman, the Tokyo 2020 champion, raised her national record to 71.46m in April and delivered on the same expectation as Duplantis with a winning effort of 68.35m.

Croatia’s London 2012 and Rio 2016 champion Sandra Perkovic was second on 65.50m.

All three of the concluding distance races registered the fastest times seen so far this year.

While the Tokyo 2020 5,000 and 10,000m champion Sifan Hassan of The Netherlands, billed to run in the two miles race, did not do so, Niyonsaba, who was disqualified in the Olympic 5,000m but finished the season as Diamond League champion, did - and she won in a meeting record of 8min 59.08sec.

Kenya’s Beatrice Chebet was second in 9:14.71.

The 8:58.58 world best set by Ethiopia’s Meseret Defar in 2007 still stands.

Gidey clocked 14:12.98 in the women’s 5,000m but was beaten by compatriot Ejgayehu Taye in a meeting record of 14:12.98.

In the concluding men’s 5,000m, Cheptegei finished well short of his own world record of 12:35.36 but won in 12:57.99.