BOSTON — Chris Sale wasn’t about to slow down the way he was pitching. Sale struck out 13 over seven dazzling innings, Mitch Moreland hit a two-run homer and the Boston Red Sox won the weekend and season series over the Seattle Mariners with a 5-0 victory on Sunday afternoon. “You try to find a good rhythm and tempo, find a groove and keep it going,” the 6-foot-6 lefty said after posting his first scoreless outing since going six shutout innings in his first start of the season. He even had a solution when the Mariners’ hitters started stepping out of the batter’s box attempting to disrupt his rhythm. “Keep throwing strikes,” he said.