Former Major Leaguer and the oldest pitcher in Japanese pro baseball, Koji Uehara, will retire.
The 44-year-old made his professional debut with the Yomiuri Giants in 1999.
In the year, he won 20 games and picked up various titles, including the pitcher with most wins, the prestigious Sawamura Award for the best pitcher of the season and the rookie champion.
Over the next decade, he won 112 games as the Giants' ace pitcher.
Uehara also played for Japan's national team at the Athens and Beijing Olympics, as well as the first World Baseball Classic in 2006.
In 2009, he declared himself a free agent and moved to the Major Leagues. He played for four teams in the leagues and helped one of them, the Boston Red Sox, win the World Series.
After returning to the Yomiuri Giants last season, Uehara achieved his career 100th win, 100th save and 100th hold in July.
Uehara is scheduled to hold a news conference on Monday to explain his decision to retire.