Gregory Polanco, who played eight seasons for the Pittsburgh Pirates, powered the Pacific League’s Lotte Marines to a 4-1 win over the Rakuten Eagles with a pair of two-run home runs. Polanco, who tied for the PL home run lead last season, opened the scoring at Zozo Marine Stadium with a first-inning homer off veteran right-hander Takayuki Kishi (2-7). “I wasn’t thinking anything in particular. I was just focused on making good contact,” the left-handed-hitting Polanco said of the first-inning homer. “The second one (to left center in the third) made me really happy because when I hit them the…