Josh Hamilton hit his 25th home run of the season as the Rangers defeated the A's for their 50th win of 2012. Texas is the first major league team to reach the mark this year. Martin Perez earned his first victory in his first major league start as well. "He did an outstanding job for it being his first time out there," manager Ron Washington said. "He had great mound presence. He threw enough changeups to get them off his fastball. He spotted his fastball well down in the zone. He competed. He was very good."