Eiichi Koyano hit a game-winning homer in the 10th inning to lift the Hokkaido Nippon Ham Fighters to a 5-4 victory over the Chiba Lotte Marines on Saturday.
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Koyano's leadoff blast against Yasuhiko Yabuta (1-3) over the left-center wall ensured that Nippon Ham remained in first place in the Pacific League. Shintaro Eijiri (5-1) pitched three shutout innings in relief for the win at Sapporo Dome.
Lotte grabbed a 3-1 lead by the fifth, which featured a two-run shot by Koichi Hori. Tomoya Satozaki added a solo drive in the sixth but Nippon Ham battled back before tying it on an Atsunori Inaba RBI single in the seventh.