Mar 21, 2019; Tokyo,JPN; Oakland Athletics former pitcher Keiichi Yabu and Seattle Mariners former center fielder Ken Griffey Jr. shake hands after the Ceremonial First Pitch before the game between the Oakland Athletics and the Seattle Mariners at Tokyo Dome. Mandatory Credit: Darren Yamashita-USA TODAY Sports

Mar 21, 2019; Tokyo,JPN; Oakland Athletics former pitcher Keiichi Yabu throws the Ceremonial First Pitch before the game between the Oakland Athletics and the Seattle Mariners at Tokyo Dome. Mandatory Credit: Darren Yamashita-USA TODAY Sports

Mar 21, 2019; Tokyo,JPN; Oakland Athletics former pitcher Keiichi Yabu and Oakland Athletics former infielder Akinori Iwamura shake hands after the Ceremonial First Pitch before the game between the Oakland Athletics and the Seattle Mariners at Tokyo Dome. Mandatory Credit: Darren Yamashita-USA TODAY Sports

San Francisco Giants relief pitcher Keiichi Yabu throws a pitch in the seventh inning against the Arizona Diamondbacks during their MLB National League baseball game in San Francisco, California April 14, 2008. REUTERS/Robert Galbraith (UNITED STATES)

San Francisco Giants relief pitcher Keiichi Yabu watches after his pitch to Milwaukee Brewers batter Bill Hall in the fifth inning of the Brewers home opener in their National League MLB baseball game in Milwaukee, Wisconsin April 4, 2008. REUTERS/Allen Fredrickson (UNITED STATES)

San Francisco Giants relief pitcher Keiichi Yabu prepares to deliver a pitch to Milwaukee Brewers batter Bill Hall in the fifth inning of the Brewers home opener in National League MLB game in Milwaukee, Wisconsin April 4, 2008. Hall hit the pitch out for a three run home run in the Brewers win over the Giants. REUTERS/Allen Fredrickson (UNITED STATES)

San Francisco Giants pitcher Keiichi Yabu of Japan throws against the Los Angeles Dodgers during the seventh inning of their opening day National League MLB baseball game in Los Angeles, March 31, 2008. REUTERS/Lucy Nicholson (UNITED STATES)

San Francisco Giants pitcher Keiichi Yabu throws at the team's baseball spring training camp in Scottsdale, Arizona, February 25, 2008. REUTERS/Jeff Topping (UNITED STATES)

Oakland A's reliever Yabu collects a high-five from catcher Kendall after the A's win over the Red Sox in Boston. Oakland A's reliever Keiichi Yabu (R) collects a high-five from catcher Jason Kendall after the A's 12-3 win over the Red Sox at Fenway Park in Boston, Massachusetts September 18, 2005. REUTERS/ Neal Hamberg

Red Sox Ramirez reacts after being hit by a pitch by Oakland Athletics closing pitcher Yabu with the bases loaded in the tenth inning at Fenway Park. Boston Red Sox Manny Ramirez reacts after being hit by a pitch by Oakland Athletics closing pitcher Keiichi Yabu with the bases loaded in the tenth inning at Fenway Park in Boston, Massachusetts September 16, 2005. The Red Sox won 3-2. REUTERS/Jessica Rinaldi

Detroit Tigers' Carlos Pena rounds the bases after hitting a two-run home run off Oakland Athletics reliever Keiichi Yabu in the eighth inning of their MLB game at Comerica Park in Detroit, Michigan August 24, 2005. Pena is 9-for-16 with six home-runs and 12 RBI since being recalled from triple-A Toledo on August 17. Oakland defeated Detroit 9-2. REUTERS/Rebecca Cook RC/DY