Reese sneaked into the long jump final as the 12th and last qualifier, but stamped her authority all over the event with a 7.01m leap in the second round.
Nigeria’s Blessing Okagbare, who was due to go in the 100m yesterday, took silver.
Mo Farah might have trademarked the last-lap burst in the last three seasons, but Dibaba has been doing it for years and nobody could live with her as she secured a hat-trick of world 10,000m titles to go with two 5,000m world titles and three Olympic golds.
Kenya’s Gladys Cherono tried to go with her, but had to settle for silver as Ethiopian Belaynesh Oljira pipped Kenya’s Emily Chebet on the line for bronze.
In early action, English Gardner of the US set the pace in the first round of the women’s 100m, running through the line in 10.94 seconds.
A host of other Americans and Jamaicans were also in with a shot at the title in yesterday’s final, when it was not beyond the realms of possibility that all eight lanes could be filled by athletes from the two sprinting superpowers.
Russia’s double world and Olympic pole vault champion Isinbayeva, who says she will retire after the worlds, made a low-key appearance to qualify for today’s final — which is likely to be a noisy and emotional occasion.