Catcher Tomoya Satozaki connected for a grand slam in the bottom of the first inning Sunday to power the Pacific League-leading Chiba Lotte Marines to a 6-3 win over the Yokohama BayStars in an interleague game.

Tsuyoshi Nishioka and Lee Seung Yeop added solo homers in the second and third innings respectively at Chiba Marine Stadium as Bobby Valentine's team won for the seventh time in their last eight games.

Chiba Lotte starter Shunsuke Watanabe improved to 8-1 on the season after giving up three runs on five hits over eight innings.