Defending champion Ratchanok Intanon outclassed Chloe Birch of Great Britain to set up a Malaysian Masters quarter-final showdown on Friday with world No 1 Tai Tsu Ying of Taiwan.

American naturalised Zhang Beiwen caused the biggest upset in the Toyota Thailand Open on Friday as she knocked the top seed and world No 2 Akane Yamaguchi of Japan out at the quarter-final stage at the Nimibutr National Stadium in Bangkok.