BOSTON — Colton Cowser had never played at Fenway Park before.

But he had been to JetBlue Park, the Red Sox’s spring training home that’s also known as Fenway South because it features the same outfield dimensions as the famous Boston ballpark. He speculated that it would probably feel the same.

He stuck with his theory, even after being told that Boston’s home opener, which featured a sellout crowd of 36,093 and an emotional pregame ceremony honoring the late Tim Wakefield and the 2004 Red Sox World Series championship team, would probably be a great deal louder. And, perhaps, a little meaner — Boston fans are known to boo their opponents, especially their division foes.

Cowser wasn’t alarmed. He didn’t perform great during his one spring training game at Fenway South, striking out twice. On Tuesday, up north, he showed that he had no trouble handling the atmosphere, hitting two doubles and four of the Orioles’ RBIs as Baltimore beat Boston 7-1. The rest of the offense also rebounded from a rough weekend, getting 13 hits in the win.

“It was fun,” Cowser said of his first time playing at Fenway.

And his performance here?

“That was fun too,” he added. “It was a great team win.”

This, though, is exactly how this new, more-confident-at-the-plate Cowser would expect his day to go. He knows his first stint in the majors — when he accumulated just seven hits in 61 at-bats — wasn’t indicative of the type of player he was. But he went to work in the offseason, tinkering with his set-up and creating a consistent hand placement that he could replicate in every plate appearance.

The changes were evident in spring training, albeit not in that one appearance at JetBlue. He hit .275 down in Florida, earning a spot on the opening day roster. He didn’t get a start until the fifth game of the season, but he had two hits that day and has continued to get opportunities.

“I feel like this year, going about it a lot better than I did last year,” Cowser said. “Having those struggles last year, understanding and figuring out what my role was. This year understanding that and being the best that I can at doing that and staying ready whenever I’m called upon.”

Cowser’s two-hit day came at a time when the other Orioles outfielders have been struggling at the plate. Austin Hays, whose spot Cowser took in left field on Tuesday, is 2-for-26 this season. Cedric Mullins isn’t faring much better — he’s hitting .188 after collecting two hits himself on Tuesday.

The left-handed hitting Cowser even remained in the game when a lefty pitcher took the mound, showing either that he has earned the trust of manager Brandon Hyde or that Hyde didn’t think a slumping Hays would fare any better.

And while the outfield prospects on the Triple-A Norfolk Tides continue to out-hit their competition, Cowser should be safe in his spot as long as he continues to hit, due to his strong defensive skills. He can play all three positions at an above-average level, while Heston Kjerstad and Kyle Stowers are usually obligated to either corner.

“He’s just walking around a little bit differently,” Hyde said of Cowser. “There’s more confidence there. I like the swing adjustments he made this offseason to stay behind the baseball better. I just think he’s more comfortable.”

And while Cowser worked toward cementing his place in the majors, Corbin Burnes continued to show why the Orioles gave up two young prospects for the starter. He allowed two hits in the first, including a 413-foot blast from Tyler O’Neill that went over the Green Monster. He didn’t feel like he settled in until the third inning, and didn’t think his command or spin was on. Still, he did not allow another hit or run after the first inning as he pitched seven innings for the first time in an Orioles uniform.

He has allowed just four runs and has struck out 20 in his first three starts with the Orioles.

“For whatever reason, today it just took me 25, 30 pitches to get in that groove,” Burnes said. “Ideally you’d like to figure it out before that, but we are fortunate to make barely good enough pitches to get to 30 pitches before we locked down.”