From mlb.com:

In 28 games, the two-time All-Star batted .345 with 39 hits and 28 RBIs in 113 at-bats. He also led the league with a .735 slugging percentage, 13 home runs and 31 runs scored. Among his 18 extra-base hits last month, five were doubles. To cap off his brilliant July, Matsui slammed two home runs on Tuesday against the White Sox.