The Russian had lost the opening game and trailed 14-18, but levelled the deficit. Sen had match point at 20-19, which Sirant staved off, before finishing the match strongly in the third game.
In the quarterfinals he takes on India’s Mithun Manjunath, who beat Malaysia’s Soong Joo Ven in a thrilling third game.
Manjunath led 19-15 but Soong caught up with him and held two match points, before the Indian edged him, 16-21 21-16 23-21.
In the top quarter, Frenchman Arnaud Merkle takes on HS Prannoy, who overcame a strong challenge from countryman Priyangshu Rajawat, 21-11 16-21 21-18.
Pusarla overcame the challenge of USA’s Lauren Lam 21-16 21-13.
♦In men’s doubles, second seeds Vladimir Ivanov/Ivan Sozonov eased into the quarterfinals, where they face Malaysia’s Man Wei Chong/Tee Kai Wun.
♦Three Malaysian pairs are in the quarterfinals of the women’s doubles. Vivian Hoo/Lim Chiew Sien will face compatriots Low Yeen Yuan/Valeree Siow in the lower half of the draw, while another Malaysian pair, Anna Ching Yik Cheong/Teoh Mei Xing, face home duo Ramya Venkatesh Chickmenhalli/Apeksha Nayak in the top half.
♦In mixed doubles, eighth seeds William Villeger/Anne Tran overcame stiff resistance from Sri Lanka’s Sachin Dias/Thilini Hendahewa in the opening game to progress into the semifinals, 27-25 21-14.