While Saina continued her march ahead, reaching the final eight with an easy win over Rituparna Das 21-15, 21-9, top seed Srikanth edged out Malaysia's Iskandar Zulkarnain Zainuddin 22-20, 20-22, 21-11 in a men's singles match.
Olympic bronze medallist Saina, who climbed the ranking chart to No.3 position, will next clash with 2011 National Games champion Arundhati Pantawane, who defeated Spain's Beatriz Corrales 22-20, 22-20, while Srikanth faces off fifth seed Wei Feng Chong of Malaysia.
Two-time bronze medallist at World Championship, Sindhu too lived to her reputation as the third seeded Indian got across Singapore's Jiayuan Chen 21-18, 21-14. She will lock horns with sixth seed Thailand's Porntip Buranaprasertsuk on Friday.
Eighth seed PC Thulasi also notched up a 21-7 21-15 win against Russia's Evgenia Dimova 21-7 21-15 to make it to the quarter-finals. She will next face fourth seed Nichaon Jindapon of Thailand.
However, it was curtains for young Tanvi Lad, whose gruelling fight against World champion Carolina Marin, seeded second, ended with a 23-21, 19-21, 6-21 defeat.
In men's singles event, Commonwealth Games champion Parupalli Kashyap, seeded third, emerged victories after 11th seed Misha Zilberman of Israel conceded the match at the fag end, lagging 16-21, 12-20.
Kashyap, who had won the Syed Modi men's title in 2012, will next take on Singapore's Zi Liang Derek Wong.
Sixth seed B Sai Praneeth too entered the last eight after edging out Thailand's Suppanyu Avihingsanon, seeded 15th, 21-16, 24-26, 21-13 in another men's singles match.
Commonwealth Games bronze medallist, RMV Gurusaidutt, seeded eighth, saw off Thailand's Thammasin Sitthikom 21-16, 21-19. Fourth seed H S Prannoy too made it to the quarter-finals after his rival Russia's Vladimir Ivanov, seeded 13th, retired midway lagging 12-21, 2-5. He will take on compatriot Guru.
Among others, German Open winner Arvind Bhat, seeded 16th, lost to Malaysia's Wei Feng Chong 6-21, 11-21, while seventh seed Sourabh Varma too fall by the wayside after losing a hard-fought battle 21-16, 17-21, 16-21 to Derek Wong, seeded 10th.
Image: Saina Nehwal
Photograph: PTI
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