India's leading professional cueist Pankaj Advani scored a major upset win over Mark Allenof Northern Ireland to join compatriot Aditya Mehta in the pre-quarterfinals of the Indian Open world snooker ranking tournament in New Delhi. While the eight-time world champion Advani, ranked 70th in the world, stamped his class with a 4-2 win over world number 11 Allen in the final round of 32 match, the Cali World Games gold medallist Mehta had a 4-1 win over England's Hammad Miah.Both the cueists will be seen in action today with Advani up against world number 12 England's Stuart Bingham while Mehta playing two-time world champion Mark Williams.