PV sindhu lost the final game 18-21, 18-21 against Chinese Taipei, and it was apparent that it just wasn't her day, as Ying put on an exceptional show of gamesmanship. But a string of errors and a flawless display by Tai lead to Sindhu losing 5 straight points and the match itself.
Second-seeded Sindhu is the flag bearer of Indian challenge in the tournament, after a surprise crash out of Olympic bronze medallist Saina Nehwal and HS Prannoy in second-round of the event on Thursday.
Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo of Indonesia beat Mads Conrad-Petersen and Mads Pieler Kolding of Denmark 21-12, 21-18 in the men's doubles final.
Christinna Pedersen and Mathias Christiansenwon the Mixed doubles crown.
The final match lasted for 44 minutes.
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It is the second time in consecutive years that Ying has defeated Sindhu at Hong Kong Open finals. Can India's PV Sindhu defeat Tai Tzu Ying.
The fifth seeded Chen, who won his fourth China Open title in Fuzhou last Sunday, faces either sixth seeded compatriot Shi Yuqi or Malaysia's No.8 seed Lee Chong Wei in today's final.
After the Hong Kong tournament, all the top players will have a couple of weeks' break before heading to the season-ending Dubai World Series Finals.
Sindhu outclassed the 2013 World Champion Ratchanok Intanon and current world no. 6, 21-17 21-17 in a 43-minute women's singles semi-final.