Masataka Yoshida went 3-for-4 with a homer and four RBIs as he helped the Boston Red Sox to a 7-0 victory over the Oakland Athletics on Thursday. Batting sixth in the lineup as designated hitter, Yoshida fired Boston to an early lead with a two-RBI single in the bottom of the first at Fenway Park. He completed the rout in the sixth inning with his fourth home run of the season, flying to right center field off left-hander Kyle Muller’s 3-1 fastball. Red Sox starter Tanner Houck held the A’s to two hits and three walks over six scoreless innings. Boston’s Wilyer Abreu also went 3-for-4 with a h…