Castro entered Tuesday having played 95 games, which is 25 shy of his career-high 120 a year ago. He also had 359 at-bats, which means he should surpass the career-best 435 at-bats in 2013, a season in which he missed the final two weeks after having a cyst on right knee drained.
Castro, of course, missed the entire 2011 season following a devastating knee injury suffered in Spring Training that year, and he battled knee and foot injuries in '12.
"I've been pretty happy with it," he said. "I've been feeling physically pretty good. I've been thankful and lucky for that, and I just keep getting my work in so I can finish the season healthy and as strong as I can."
Castro has started at catcher in 82 of the Astros' games this year and also has made 11 starts at designated hitter.
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.