Brett Anderson surrendered just an unearned run over six innings Friday to move to 4-0 as the A's beat the Mariners 6-1. The A's were the first team to rough up Hisashi Iwakuma in the couple of months since he moved into the rotation, not that Anderson really needed it. He allowed just one extra-base hit in the game, and he didn't walk anyone. He's walked a total of three batters while winning all four of his starts since coming back from Tommy John surgery.