The 27-year-old, who won the distance double at the Beijing 2008 Games, saw off Kenya's Sally Kipyego and Vivian Cheruiyot with a final-lap burst to win by more than five seconds.
Dibaba's time was a season's best 30:20.75, with Kipyego taking the silver in 30:26.37 and world champion Cheruiyot bronze in 30:30.44.
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