DETROIT >> The Oakland Athletics left home as a .500 team, looking for a spark. They're returning to the Coliseum looking very sharp.Jed Lowrie had two more hits, Sean Manaea pitched six strong innings and the Athletics beat the Detroit Tigers 4-2 Thursday to sweep a four-game series."It is really tough to sweep a four-game series, especially when the other team scores first in three of the four games," Oakland manager Bob Melvin said.