At the age of 16 years and 3 months, Yamaguchi became the youngest player ever to win the BWF Super Series tournament by beating her compatriot Shizuka Uchida in the final of 2013 Japan Super Series.
Pada usia 16 tahun dan 3 bulan, Yamaguchi menjadi pemain termuda yang pernah memenangkan turnamen BWF Super Series dengan mengalahkan rekan senegaranya Shizuka Uchida di final 2013 Japan Super Series.