Olympic silver medallist shuttler PV Sindhu eked out a hard-fought win over world number two and defending champion Akane Yamaguchi in the opening women’s singles group A match of the World Tour Finals. However, Sameer Verma, couldn’t adjust to the pace of world no. 1 and world champion Kento Momota, going down 18-21 6-21 in the opening group match. Sindhu, who had finished runners-up at the last edition in Dubai, dished out a superb game, mixed with patience and aggression, to defeat the Japanese 24-22 21-15. Making her third successive appearance at the tournament, Sindhu, who had a 9-4 head-to-head record against Yamaguchi, produced a controlled game in slow conditions, never letting go despite lagging behind many times in the match.