Thirty-four-year-old Tetsuya Yamauchi is planning to retire at the end of the season. A press conference is expected within the next few days.
Yamaguchi told reporters that he wanted to end his career with the Giants. He also told reporters his shoulder had been giving him problems the last few years.
[UPDATE 10/6 @ 6:43am]
Yamaguchi held a press conference at a hotel in Tokyo on October 5. He told the media that he decided to retire because he was never called up to Ichi-gun this season and because he hurt his left shoulder in September. He also told the media he never thought he would have a career that lasted over ten years and felt there was nothing else for him to accomplish.
Tetsuya Utsumi, Hisayoshi Chono, Hayato Sakamoto, Hirokazu Sawamura, Tomoyuki Sugano, Ryosuke Miyaguni, Toshiya Sugiuchi, and Shuichi Murata made appearances at the end of the press conference. They gave Yamaguchi flowers.
Source: Yomiuri 10/5/2018