Right-hander Shun Yamaguchi held Central League-leading Yomiuri Giants to an unearned run over six innings, and veteran Hitoshi Tamura hit a two-run homer on Wednesday as the DeNA BayStars beat the Giants 6-2.Right-hander Shun Yamaguchi held Central League-leading Yomiuri Giants to an unearned run over six innings, and veteran Hitoshi Tamura hit a two-run homer on Wednesday as the DeNA BayStars beat the Giants 6-2.