"But he's one of those guys who walks out of here and, trust me, he gets it. One thing I got is his face got a little different color."
Tillman, who will be followed by Ubaldo Jimenez in the rotation, had a breakout 2013 season in which he came off the disabled list to pitch the team's fifth game and went on to post a 16-7 record with a 3.71 ERA in 33 starts. The 25-year-old Tillman, who won as many games in 2013 as the previous four seasons combined, was named to the American League All-Star team last year.
This will be his second year starting the season on the Opening Day roster. He pitched the second game for the Orioles in 2011 against the Rays.
"Any time you get the chance to get that kind of opportunity, it's a big deal," Tillman said. "Number one, it's an honor, it's exciting. At the same time, it's important for the team to get us started in the right direction, the season going the right way. I think we are all just excited to get this thing going."
Was Tillman thinking about the possibility that he would be the Orioles' Opening Day starter?
"Not at all, to tell you the truth," he said. "Like I've said since Day 1, we've got five guys in here capable of doing it. It's special, but at the same time, we got to take it by the horns and run with it. It is an important game."
Tillman, who is a big routine guy, said he won't approach it any differently considering he's facing the defending World Series champion Red Sox. He will be opposed by Jon Lester, with Boston sending John Lackey to the mound against Jimenez.
With the Orioles opening the season at Camden Yards, Tillman did acknowledge there's a little extra pressure in pitching that first game.
"All the hype of Opening Day, yeah," said Tillman, who is the fifth different Oriole to start on Opening Day in five years and the youngest since 1994. "Whether you're sitting in the dugout or pitching, it's the same thing. There's pressure for everyone. I've been in the dugout, and I've been more nervous watching than being a part of it. It's just a matter of getting the team going in the right direction. I think it's important.
Tillman has become a rock of consistency for the Orioles after struggling to establish success over an extended period of time in his first few seasons. He went back-and-forth between Triple-A Norfolk and Baltimore until finally hitting his stride in July 2012.
"I don't think anybody who got to know Chris and see him evolve as a young man, I don't think that part of it was surprising. For instance, [former GM] Andy MacPhail a long time ago when he made the deal," Showalter said of Tillman's rise since he was acquired from Seattle in the 2008 trade that sent Erik Bedard to the Mariners.
"People thought this might be where he'd land, and you see it physically and you see the way he carries himself. This is part of the evolution and why people in player development project players. That's why certain things in the game are a science, and certain things down here are viewed as an art. There are things about Chris you can't put on paper. Running down the hall trying to hide from me so I don't take him out of the game -- where do you put that on a pie chart? Anyway, I'm proud of him. He deserves it."
Tillman is 32-25 with a 4.28 ERA in 84 career Major League starts, and Jimenez -- signed to a four-year, $52 million contract this spring -- will be making his Orioles debut.