Indian shuttler Sankar Muthusamy Subramanian caused a major upset by knocking out World No. 2 Anders Antonsen of Denmark in a thrilling three-game contest to reach the men’s singles quarter-finals of the Swiss Open Super 300 badminton tournament here.

The 21-year-old from Tamil Nadu, a silver medallist at the 2022 World Junior Championships and currently ranked 64th in the world, put up an impressive display of defence to take down Antonsen 18-21, 21-12, 21-5 in a 66-minute match.