Kammala jumla mai zuwa: Yamaguchi ya yi gasa a Gasar Gasar Curling ta Duniya ta maza sau shida a cikin aikinsa. A gasar cin kofin duniya ta 2009 a Moncton, New Brunswick, Kanada, ya buga wasa na uku ga tawagar Japan, wanda ya zama na goma a gasar; A gasar cin kofin duniya ta 2013 a Victoria, British Columbia, Kanada, ya buga wasa na uku ga tawagar Japan, wanda ya zama na 11 a gasar; A gasar
A gasar cin kofin duniya ta 2014 a Beijing, China, ya buga wasa na uku ga tawagar Japan, wanda ya zama na biyar a gasar; A gasar cin kofin duniya ta 2015 a Halifax, Nova Scotia, Kanada, ya buga wasa na uku ga tawagar Japan, wanda ya zama na shida a gasar; A gasar cin kofin duniya ta 2016 a Basel, Switzerland, ya buga wasa na biyu ga tawagar Japan, wanda ya zama na hudu a gasar; kuma a gasar cin kofin duniya ta 2017 a Edmonton, Alberta, Kanada, ya buga wasa na biyu ga tawagar Japan, wanda ya zama na bakwai a gasar. Ya buga na biyu don Yusuke Morozumi rink kuma ya wakilci Japan a wasannin Olympics na 2018, inda ya gama a matsayi na 8.