Cash said the Rays have a number of players who can hit second, but they opted for Morrison in the opener.
"There wasn't a specific reason why, other than we like him hitting at the top," Cash said. "We view him as a really good bat, and we want him to get as many at-bats as possible. ... We think he's going to be on base for us a lot."
The idea of batting Jennings in the middle of the order dates back to last spring.
"When D.J. and I talked, the thought was to move him into the middle of the order rather than lead him off," Cash said. "And that same thought still applies."
Finally, in regard to Conger getting the start at catcher over Curt Casali:
"Obviously we're going to play some matchups," Cash said. "Stroman is a very good pitcher. And we like how Hank has handled the bat -- especially against righties. He's actually come on strong.
"What he's done on the back field, where we were trying to get him at-bats, he's swinging the bat really well. I spoke with Arch. He's very comfortable speaking to both of them. So that was basically it. Curt's going to play quite a bit."
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.