Box score SEATTLE – With a wicked splitter and nasty movement on all his pitches, Mariners righthander Hisashi Iwakuma doesn’t need much help. He has dominated opponents for more than a month, and Monday night against the Astros was no exception. On a night they needed to play clean baseball in order to have any shot against Iwakuma, the Astros committed three errors and lost 3-2 as the Mariners pulled away with two unearned runs. Fittingly for a pair of teams at the bottom of the American League West standings, only two of the five combined runs scored were earned before a crowd of 12,811 at Safeco Field. Iwakuma (7-1) [...]