"It's awesome. Three days in," said Ka'aihue, who just joined the club on Wednesday.
Billy Butler was moved from first base into the designated hitter spot and DH Jose Guillen got the night off. Ka'aihue was also behind Butler in the batting order, swinging fourth.
"That's where I'm comfortable. That's where I've batted my whole career," he said.
Manager Trey Hillman had no hesitation about putting the rookie in the cleanup spot, normally filled by Guillen.
"He's got a good short stroke right now and I thought it was a good day for Jose to get a day off," Hillman said. "He's got a presence about him that fits the profile of a No. 4. I hope it plays out that way, I hope he gets some pitches to hit."
However Ka'aihue went 0-for-3 with a strikeout, and didn't get the ball out of the infield, before being pulled for a pinch-hitter.