Fullerton (US), June 26 -- India's Rounak Chouhan created the biggest upset of the US Open badminton tournament here when he packed off World no 6 and men's singles top seed Chou Tien Chen of Chinese Taipei in straight games.

World No. 80, Chouhan, who was part of India's bronze medal winning world junior campaign, defeated Chou 21-17, 26-24 on Thursday to set up a last eight clash against Misha Zilberman of Israel.

The 18-year-old India kept the pressure on his more experienced opponent from the start and though Chou kept his nose ahead till 17-15, Chouhan won six straight points thereafter to pocket the opening game.

Chou was the dominant player for most part of the second game as he commanded a 17-11 lead before Chouhan once again bag...