Chris Johnson had been waiting all season to hit his first home run. After finally knocking one out of the park in his first at-bat Wednesday, there was almost no wait for No. 2. Johnson had a pair of homers in consecutive at-bats among his four hits and drove in a career-high six runs to back up another solid outing by Wandy Rodriguez, and the Houston Astros beat the New York Mets 8-1 to complete a three-game sweep.