Friday night marked his 48th game since being reinstated from the disabled list in June.
"I feel good," Morrison said. "I'm getting more comfortable in the box. But I feel you're only as comfortable as your last AB."
Morrison is enjoying a productive August, batting .340 (16-for-47) with nine RBIs.
For the season, he is hitting .276 with four homers and 21 RBIs.
Missing so much time the past two seasons has put the left-handed-hitting first baseman in position of playing catchup.
"I don't really feel the fatigue part of it," said the first baseman, who turns 26 on Aug. 25. "The mental grind hasn't gotten to me. It's taking every game as another game. Every at-bat is another at-bat, and every pitch is the pitch you've got to win. Just staying in the moment, which is what you've got to do."
He credits a change in his hitting stance for helping him improve his timing.
"I think it's a mechanical change," Morrison said. "Not to get too technical, it's staying behind the ball."
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter