World No. 1 Akane Yamaguchi suffered an upset defeat to 32nd-ranked Yeo Jia Min of Singapore 2-0 in the second round of the women's singles at the badminton world championships on Tuesday.Playing in her opening match, Yamaguchi, who is recovering from a lower back injury, struggled to get the shuttle consistently over the net and keep it inside the boundary lines at St. Jakobshalle, eventually going down 21-14, 21-18 in just 40 minutes."I haven't been able to practice enough so I lacked speed. I let my opponent take control of the match and I couldn't get into my rhythm," the 22-year-old Ja…READ FULL ARTICLE