World champion Akane Yamaguchi of Japan defeated Taiwan's Tai Tzu-ying 21-18, 22-20 to claim the women's singles crown at badminton's World Tour Finals on Sunday.Yamaguchi took 46 minutes to wrap up the championship decider in Bangkok against the silver medalist of last year's Tokyo Olympics, at which the top Japanese hope made a disappointing quarterfinal exit."I don't know if it was my best match of the tournament, but I think I played really well," Yamaguchi said. "My plan was to defend well and attack with composure when chances came."Yamaguchi came from behind to take the first set. In…READ FULL ARTICLE