Despite winning the first game, Watanabe and Higashino eventually lost the match to Tokyo 2020 gold medallists Wang and Huang from China.
Her senior stage performances proved to be even more inspiring.
The mixed doubles will be contested by Lauren Smith and former Olympic medallist Marcus Ellis.
The highest scoring player from each group will then progress to the knockout phase of the competition.
In women's doubles, the two teams representing South Korea will face off for bronze while Greysia Polii and Apriyani Rahayu of Indonesia will challenge China's Chen Qing Chen and Jia Yi Fan for gold.
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Sindhu lost the semi-final 18-21, 12-21.
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