MINNEAPOLIS — Though Andrew Morris has handled a multitude of relief pitching roles for the Minnesota Twins this season, his manager has identified one constant through it all.“Lack of heartbeat, and I mean that in such a beautiful way,” manager Derek Shelton said.He’s only a rookie, but Morris is showing the type of maturity that comes with experience as he adapts to life in the bullpen. Morris’ even-keel nature, and a 96 mph fastball, is leading to increasingly more opportunities such as Wednesday’s, when the rookie was tasked with closing the game.Making the first save attempt of his career, Morris breezed through the middle of the Houston Astros lineup to close out a 4-1 victory. Morris retired the side on 10 pitches to make a winner of Joe Ryan, who struck out nine over six dominant innings.“You love that about (Morris), that he doesn’t get too high or too low,” Shelton said. “Nothing has really affected him. The transition to the bullpen, the transition then to a smaller role, then transition to leverage, he’s handled everything about as well as a young kid could.”Pitching for the third time in four days, Shelton was interested to see how Morris’ velocity looked. Until earlier this month, Morris never pitched on consecutive days. The Twins are looking for signs of how he’s holding up to throwing more frequently.When Morris’ first offering to Yordan Alvarez registered 95.2 mph, Shelton knew his pitcher was in a good spot. Morris needed only nine more pitches to retire Alvarez, Christian Walker and Jake Meyers and convert the save. Not only did Morris generate two swings-and-misses in his 10-pitch outing, but also his fastball average increased to 96.6 mph, up from his 95.8 mph season average.“I was trying to tell myself that’s what I’ve been working towards,” Morris said. “I want to be the guy in those spots. I think I can be really good at it. I appreciate the trust and the experience that I’ve been building.”After joining the Twins two weeks into the season, Morris primarily worked as a long reliever. His first six outings all went one-plus innings, and four were 2 2/3 innings or longer.But as the Twins hold open auditions to fill the back-end void in their bullpen, Morris is finding himself pitching in more high-leverage situations.“He’s a jack-of-all trades right now,” pitching coach Pete Maki said. “He’s provided length. He’s provided short bursts. He’s been low maintenance about it, and he’s done a nice job.”Though he’s been a starter for the majority of his career, Morris isn’t fighting a transition to relief. He wants to play a meaningful role in any way he can and thinks he can be successful in the role.