The Rio 2016 gold medallist and second seed came through in three games against Intanon at the Stadium Perpaduan in Kuching.

Marin eased to the first game but things got trickier before she saw out a 21-8, 18-21, 21-12 success.

She will now meet Japan's Nozomi Okuhara in the last four, who beat her fourth-seeded compatriot Akane Yamaguchi 21-18, 22-20.

Chinese Taipei's top seed Tai Tzu-ying had to battle through against China's Chen Yufei, eventually winning 21-17, 20-22, 24-22.

Her reward is a date with third seed Sung Ji-hyun of South Korea, who ousted China's Sun Yu 21-11, 21-15.

In the men's tournament, Lee Chong Wei continued his quest for a 12th title at his home event by beating Jeon Hyeok-jin of South Korea 21-11, 21-14.

The top seed will now play Wong Wing Ki of Hong Kong in the last four, who walked straight into the semi-finals after Chinese opponent Chen Long, the reigning Olympic champion, withdrew due to a wrist injury.

South Korea's Son Wan-ho booked his place through by beating India's Ajay Jayaram 21-18, 21-14.

He will play China's double Olympic champion Lin Dan, who knocked out Indonesia's Jonatan Christie 21-15, 14-21, 21-9.

Competition will continue in Kuching tomorrow.