It took fifth seed Yamaguchi only 37 minutes to blow away the Indian challenge in the last four clash.
While the first game lasted 19 minutes, the second game's duration was a minute less.
There was a sudden drop of intensity in Sindhu's performance in the first game at 14-14, when Yamaguchi reeled off seven straight points to wrap it up at 21-14.
Yamaguchi repeatedly attacked Sindhu's left side as she found it difficult to control.
The second game was a one-way traffic as Yamaguchi straightaway went 5-0 up and, at the mini-break, was leading 11-2.
She did win a few points with some deft drop shots, but it was too late in the day, as Yamaguchi won the second game at 21-9 to make it to the summit round.
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