 On February 1, 2010, Rosales was traded along with Willy Taveras to the Oakland Athletics for Aaron Miles and a player to be named later.In his first three years with the A's, Rosales batted .234 with a .292 on-base percentage in 415 at-bats, 11 home runs, 47 RBIs, and two stolen bases in four attempts.On November 30, 2012, Rosales avoided arbitration by signing a one-year, $700,000 deal with the A's.