HOUSTON — Mariners manager Scott Servais loves how his team is hitting lately. He only wishes this offensive outburst had come earlier in the season. Robinson Cano drove in three runs, three players homered and seven pitchers combined for a five-hitter in Seattle’s 9-0 rout of the Houston Astros on Wednesday night. “The frustrating thing going through the struggles we did in August and early September was you know it’s in there,” Servais said.