Marin lost the opening game 21-17 to her American opponent at the Odense Sports Park.

The third seed responded impressively to win the second game 21-17, before winning the decider 21-14.

Marin, the reigning Olympic champion, will play Germany's Yvonne Li in the last four after she came from a game down to defeat Belgium’s Lianne Tan 15-21, 21-12, 21-17.

Second seed Nozomi Okuhara booked her place in the semi-final, after the Japanese star overcame Denmark’s Julie Dawall Jakobsen 21-6, 21-12.

She will face Canada’s Michelle Li, the fourth seed, after she beat Denmark’s Mia Blichfeldt, seeded seven, 21-17, 21-7.

Chou Tien Chen came through a tough men’s quarter-final at the BWF World Tour Super 750 event.

The Chinese Taipei player narrowly lost the opening game 22-20 to India’s Srikanth Kidambi.

Chou earned the final two games 21-13, 21-16 to earn his place in the last four.

The second seed will play Denmark's Anders Antonsen, the third seed, after he beat compatriot Jan O Jorgensen, the seventh seed, 21-12, 21-10 in the semi-finals.

Denmark’s Rasmus Gemke, the seventh seed, defeated Germany’s Max Weisskirchen 21-13, 21-10.

Gemke will face Japan’s Kenta Nishimoto in the semi-finals after he beat Denmark’s Hans-Kristian Solberg Vittinghus 21-12, 21-12.

The competition is the first event staged on the BWF World Tour since the coronavirus pandemic ground sport across the world to a halt.

Competition in the Danish city will precede three back-to-back World Tour events in Bangkok, including the season-ending finals, as part of the BWF's plans to restart its international competitions following the lengthy coronavirus-enforced stoppage.