India's Somdev Devvarman caused a major upset against two-time former champion and World no 42 Carlos Moya of Spain to storm into the quarter-finals of Chennai Open ATP tournament here today. Somdev,

who is ranked 202 on ATP charts, rallied to defeat sixth seeded Moya 4-6, 7-5, 6-4 in a gruelling 131 minute second round encounter of the $4,50,000 event.