NEW DELHI, Aug. 21 -- The Indira Gandhi Indoor Stadium was a roaring cauldron of emotion on Thursday as the BWF World Championships delivered a rollercoaster of breathtaking badminton. It was a day where thundering cheers from a passionate home crowd met the cruel, razor-thin margins of elite sport. At the centre of it was India's PV Sindhu, whose quest for a historic sixth World Championships medal ended in an agonisingly close 88-minute marathon. With Ayush Shetty also losing, India's singles campaign ended but a wave of hope emerged from doubles as Satwiksairaj Rankireddy/Chirag Shetty and Treesa Jolly/Gayatri Gopichand kept the hosts' podium aspirations alive by reaching the quarter-finals. The marquee matchup of the evening pitted Sind...