Hiroshi Hirao connected for a grand slam in the top of the fourth inning Sunday to power the Seibu Lions to a 13-6 victory over the Lotte Marines.
Hirao, who had only three homers last season, gave the Lions a commanding 10-5 lead at Chiba Marine Stadium with his third homer of the season.
Rookie Shuichiro Osada picked up the win after coming on in the fourth and holding the Marines scoreless over 1 2/3 innings.
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