Three Thai women’s singles players advanced to the semi-finals of the US$120,000 Bitburger Badminton Open Grand Prix Gold in Saarbrucken, Germany, with second-seeded and world No.14 Porntip Buranaprasertsuk, bronze medalist at this year’s China Masters, thrashing world No.23 Spaniard Beatriz Corrales in comfortable two games to set up an all-Thais battle against fourth-seeded and world No.19 Nitch