The Yokohama Bay Stars announced on August 31 that they disciplined nineteen-year-old Yudai Yamamoto for underage drinking. The Bay Stars conducted an internal investigation over two days (August 29 and 30) after they received a tip via e-mail from someone outside of the organization on August 28. They learned that Yamamoto drank two to three beers at least three times since April. The Bay Stars issued Yamamoto a stern warning. He will also not be allowed to go out for the rest of the season.