Dhruv Sitwalla pulled off a 4-2 upset victory over former World champion Geet Sethi to enter the men's semi-finals, while Maharashtra's Meenal Thakur claimed the women's crown in the National Billiards Championships in Pune on Friday. Meenal outplayed Anuja Chandra of PSPB 76-59, 17-75, 76-55, 75-55 at the D Y Patil Vidyapeeth.