Guyer made a splash Friday night when he became the 108th player in Major League history to homer in his first Major League at-bat, and the first Ray to homer in his first Major League plate appearance.
"He's definitely going to be back here," Maddon said. "He fits our way of playing baseball very well."
Guyer received the news Sunday morning and handled the move with class.
"This was one of those things I didn't know what to expect," Guyer said. "I knew I came up because [Jeff] Niemann went on the DL. I guess I knew eventually they might need to have another pitcher up here. That's just me being realistic with it.
"But I just tried to make the most of my opportunity and to have fun with it. Getting sent down is only going to motivate me that much more to get back up."
Guyer glowed while talking about his experience.
"I'll just remember the feeling I got when I got the call," Guyer said. "And also knowing how good of a time I've had. It was a short time, but it was great. Nothing compares to being a big leaguer. It's what I worked my whole life for. Hopefully, I'll just continue to work hard, which I'm going to do. I'm determined to get back up here.
"... I had a little taste of [the Major Leagues] in Spring Training. It was my first big league Spring Training. So after that, I realized I want to be up here to stay. And having this opportunity makes it that much more that I want to be up here to stay. That's what I'm set on doing and that's what I plan on doing in the future."
Delaney went 1-0 with a 1.50 ERA in 12 appearances at Durham, posting 12 strikeouts and five walks in 18 innings.
Delaney received the news of his promotion Saturday night.
"Feels good," Delaney said. "I was sitting down at the house last night watching TV. [Durham manager] Charlie [Montoyo] called me up and gave me the good news."
The low-key Delaney said he's been "working on the things that I needed to improve on" and has not spent any time thinking about possible roster moves the Rays might make.
"You can't play GM, it's too tough," Delaney said.