American Douglas pips Russians to gold
Douglas triumphed with 62.232 points, just 0.259 ahead of Russia's Viktoria Komova, whose teammate Aliya Mustafina took the bronze on 59.566.
Douglas, who grabbed team gold with the US Tuesday, put in a final floor performance of 15.033, leaving Komova needing at least 15.359.
Komova, 17, put in a dazzling routine, rounding off with a near-perfect double pike, but the judges ruled it was worth only 15.100.
The entire venue held its breath until the scores were announced, sending Douglas into ecstasy and reducing Komova to tears.
Japan's Kohei Uchimura won gold in the men's all around on Wednesday, ahead of Russia and Romania.