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This is the third consecutive time that Sindhu has lost to Zhang. The American shuttler defeated Sindhu in the Indian Open final in February earlier this year.
Rio Olympics silver-medallist Sindhu is going through a difficult phase after winning the silver medal in the Jakarta Asian Games. She was knocked out in the second round of the Japan Open after a straight-game loss to Gao Fangjie.
The script played out similarly in the China Open, where the 23-year-old suffered a 11-21 21-11 15-21 loss to world no 6 Chen Yufei of China in the quarterfinals.