HOUSTON (AP) -- Billy Butler hit a three-run homer and Marcus Semien and Brett Lawrie connected to back a solid start by Scott Kazmir and give the Oakland Athletics a 8-1 win over the Houston Astros on Monday night.Kazmir (2-0) allowed three hits and one run while striking out eight in six innings.The Athletics scored three runs in the first inning before Lawrie's solo shot in second made it 4-0. Semien added a one-run homer in the fifth inning before Butler's first home run this season pushed it to 8-1 later in the inning.Butler has hit safely in each game this season and has the only eight-game hitting streak in the American League.Jose Altuve had three hits of Houston's five hits, including a solo home run in the fourth inning.Houston starter Scott Feldman (0-2) yielded 10 hits and eight runs - seven earned - in five innings for the loss.