Nishant Biswal and Khalid Sultan caused upsets by defeating fifth seed Satyadeep Das and sixth seed Mihir Vora in the second round of the first CSA All-Orissa Open Snooker Tournament at the Cue Sport Academy in Bhubaneswar today. Das lost in straight frames to Nishant Biswal, while Khalid Sultan posted a hard-fought 3-2 win over Vora. The winners were joined in the pre-quarterfinals by third seed Subrat Das and eighth seed Sureet Singh. Das registered a convincing 3-0 victory over Shivam Nag. But Sureet survived several anxious moments before defeating Ankit Bhousinka 3-2. Results: Second round: Subrat Das bt Shivam Nag 3-0 (54-17, 72-15, 102-15): Khalid Sultan bt Mihir Vora 3-2 (71-39, 31-57, 32-42, 57-22, 84-59): Sureet Singh bt Ankit Bhousinka 3-2 (18-82, 61-34, 28-52, 56-55, 52-28): Nishant Biswal bt Satyadeep Das 3-0 (47-9, 58-39, 62-21).