Ratchanok advances to Thailand Open semi-final Doubles stars Sapsiree and Dechapol also win and will face Chinese Olympic champs Home favourites Ratchanok Intanon and the mixed doubles duo Sapsiree Taerattanachai and Dechapol Puavaranukroh recorded straight-sets victories on Friday to book a place in the semi-finals of the Thailand Open badminton tournament. World No.8 Ratchanok defeated Line Christophersen of Denmark 21-8, 21-8 in the women’s singles quarter-final at Impact Arena Muang Thong Thani in Nonthaburi. She will face a tough semi-final opponent on Saturday in top seed Tai Tzu-ying of…