PETALING JAYA: World No. 2 women's doubles pair Pearly Tan-M. Thinaah have failed to maintain their perfect record in the World Tour Finals group stage after going down to Japan's Yuki Fukushima-Mayu Matsumoto on Friday (Dec 19).

Already assured of a semi-finals spot going into their Group A match at the Hangzhou Olympic Sports Centre, Pearly-Thinaah were aiming to secure top spot in the group.