Obiri, women's world 1,500 bronze medallist, shattered the African record in the 3,000 as she clocked 8:20.68, the fastest time ever by a non-Chinese runner.
Fellow countrywoman Mercy Cherono was second in 8:21.14 as the two Kenyans became the fifth and sixth fastest performers of all time in the event.
World indoor champion Genzebe Dibaba of Ethiopia, who had dominated the indoor season, ran a personal best 8:26.21 but could only finish sixth.
Men's Olympic high jump champion Ivan Ukhov of Russia recorded a season-leading 2.41 metres to pip Canadian Derek Drouin and American Erik Kynard who tied for second at 2.37.
Olympic and world champion Shelly-Ann Fraser-Pryce of Jamaica edged Nigerian Blessing Okagbare to win the women's 100 in 11.13 seconds.
World champions LaShawn Merritt and David Oliver were also winners.
Merritt took the 400 in 44.44 seconds and fellow American Oliver was first in the 110 hurdles in 13.23 seconds.
(Editing by Tony Jimenez)
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