Star Indian shuttlers P V Sindhuand Kidambi Srikanth fought their hearts out before suffering close defeats in their respective group ‘B' openers at the USD 1.5 million HSBC BWF World Tour Finals here on Wednesday.

A week after a demoralising defeat at the Toyota Thailand Open quarterfinals, world champion Sindhu produced a much-improved performance but still lost to World No. 1 Tai Tzu Ying of Taiwan 21-19, 12-21, 17-21.