District player Gargi Tandon pulled off the biggest upset on the opening day of the 2nd Punjab State Ranking Table Tennis Championship by defeating reigning champion Gulsheen Kaur (Patiala). Tandon won 3-1 in the pre-quarterfinals of the U-19 girls' category at the Table Tennis Hall in Rakh Bagh here on Friday. The three-day championship has attracted around 500 paddlers.