In a surprise move by the man who hit a grand slam on his two-homer night, Nippon Ham Fighters outfielder Tsuyoshi Shinjo said Tuesday he will retire at the end of the season.

News photo Tsuyoshi Shinjo of the Nippon Ham Fighters belts a grand slam during the seventh inning of Tuesday's game against the Orix Buffaloes at Tokyo Dome.

"Tonight, I'd like to tell everyone one thing. I've decided to hang up my spikes when the season is over," the 34-year-old Shinjo said after leading Nippon Ham to a 10-4 victory over the Orix Buffaloes at Tokyo Dome with a solo shot in the second inning and a grand slam in the seventh.