Oliver, who had been the form athlete all year and impressive throughout the competition, led early and maintained his form to take an emotional victory.
American dreams of a clean sweep came up just short as veteran Ryan Wilson took silver in 13.13 but a last-hurdle stumble by defending champion Jason Richardson allowed Russia's Sergey Shubenkov to snatch bronze in 13.24.
Olympic champion and world record holder Aries Merritt had a ragged race and could only finish sixth.
(Editing by Ed Osmond)
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