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The 21-year-old from Almora bounced back from an opening game reversal to keep his rival under pressure but in the end couldn't get across the fifth-seeded Christie.
Satwiksairaj Rankireddy and Chirag Shetty lost to Olympic champions Lee Yang and Wang Chi-Lan of Chinese Taipei in the quarterfinals.
Satwiksairaj Rankireddy and Chirag Shetty, who won the Korea Open, also advanced to the quarterfinals.
Treesa Jolly and Gayatri Gopichand staged a comeback to beat Sayaka Hobara and Yui Suizu Japan in a little over an hour to advance to the pre-quarterfinals.
Fritz, assured of breaking into the top 10 after beating Canada's Denis Shapovalov in the semifinals, also won titles in Eastbourne and Indian this year.
The 30-year-old played out of his skin and saved three match points, only to endure the agony of losing it in the end, as Chou emerged victorious in a pulsating contest.
Prannoy saw off eighth-seeded Loh 22-20, 21-19 in a 44-minute clash.
It was Srikanth's first win over his Malaysian opponent Lee Zii Jia in four meetings.
Djokovic started the Japan Open by taking part in a doubles game and switched to higher gears as the week progressed, never allowing his opponents, including world number 15 David Goffin, to pose a serious threat.
Djokovic posted some pics of his experience with the wrestlers on his Instagram handle with a caption in which he expressed his admiration for the sport and revealed that he used to follow it a lot in his childhood.