Kolkata, March 21: Unseeded Avishka Gupta stretched top seed Sravya C. Shivani of Telenga to the limit before the latter maged to enter the pre-quarterfils of the ongoing Rendez-Vous A Roland Garros - BTA-AITA tiol series tennis tourment here on Tuesday. Shivani rallied for long on the red clay courts of the Dakshin Kalikata Sansad (DKS) before defeating her Jharkhand opponent 7-5, 6-4 to reserve a spot in the last 16 stage of the U-18 girls' singles event.