Unseeded Arhaan Penwala stunned seeded Ayaan Vaziralli in straight games to enter the boys’ U-11 second round, in the Altec Lansing Khar Gymkhana-ISP Squash Championship yesterday.

Mumbai Cricket Association’s Penwala fashioned the only upset of the opening day when he beat Bombay Gymkhana’s Vaziralli 11-3, 11-3 in the first round.