Despite already possessing a reputation for maturity and calmness, Konnor Griffin must have felt an indescribable amount of pressure on his shoulders Friday.

Griffin, 19, who’s ranked as the top overall prospect in baseball, made his MLB debut at PNC Park when the Pittsburgh Pirates hosted the Baltimore Orioles for their 2026 home opener.

By the end of a 5-4 Pirates victory in front of a sellout crowd of 38,986, Griffin looked like a seasoned hand, collecting an RBI double in his first big-league at-bat while playing sharp defense at shortstop.

Griffin finished 1 for 3 with his RBI, a walk and a run scored, and Mitch Keller (1-0, 1.50 ERA) delivered a quality start of six innings, allowing two runs on six hits.

“Electric. He just provides that,” Keller said of Griffin. “He’s an electric player.”

Keller walked four and struck out four, throwing 56 of his 88 pitches for strikes.

Jared Triolo (2 for 3, RBI) was the only Pirate with multiple hits, with Oneil Cruz, Henry Davis and Ryan O’Hearn also collecting RBIs.

The Pirates (4-3) did the majority of their damage via a four-run second inning and chased Orioles starter Kyle Bradish (0-2, 6.23 ERA) after four frames.

Coming to the plate for the first time in the bottom of the second after O’Hearn drew a walk, Griffin was in a tight spot after four pitches from Bradish, who attacked him exclusively with sliders out of the zone.

But on the fifth pitch he saw, Griffin connected on a hanging curveball, launching a ball to center field, plating O’Hearn to make it 1-0.

“Just trying to be a tough out,” Griffin said. “Obviously, the first (at-bat) — a little jitters, (but) just want to get off a good swing on a good pitch and was able to get a good one and do some damage. … It was big. That was my job. Runners on base, get them in.

“That’s what you’re expected to do. Being able to execute that and being the first run of the game and getting things rolling, that was the job.”

When Griffin made contact and began running down the first-base line, the Pirates dugout exploded with celebration.

“I think he had two swings and misses before it, and nobody had any doubt that he was going to pull through,” Keller said. “Man, did he come through and start a huge rally for us. Can’t say anything better about that guy.”

Triolo then drove in Griffin with a single, followed by an RBI double from Davis and an RBI hit via Cruz, making it 4-0.

Griffin drew a walk in his second at-bat, and during his third at-bat, he displayed some swagger as he initiated a successful ABS challenge on a called third strike during the fifth.

However, two pitches later, Griffin went down swinging.

Meanwhile, Keller was a bit erratic but limited the damage.

Baltimore (3-4) scored a pair of runs in the fifth as Gunnar Henderson and Adley Rutschman hit RBI doubles to make it 4-2.

But in the bottom of the fifth, the Pirates took a 5-2 lead, courtesy of a sacrifice fly by O’Hearn against Orioles reliever Deitrich Enns, who issued three walks in his lone inning.

Yohan Ramirez, taking over for Keller in the seventh, was shaky, allowing a single to Blaze Alexander before Taylor Ward made it 5-3 with an RBI double.

That prompted manager Don Kelly to replace Ramirez with Mason Montgomery, who got the final two outs of the inning.

Dennis Santana pitched a quiet eighth, and Baltimore got within a run in the ninth when Henderson hit a solo blast off Gregory Soto.

But Soto recorded all three outs in the ninth via strikeout, retiring Pete Alonso to end the game and notch his first save of the season.

“How about that atmosphere today? Jeez, that’s the most electric that I’ve heard PNC,” said Kelly, who grew up in Mt. Lebanon. “Credit to the fans for the atmosphere, the electricity, it was unbelievable.

“I get emotional about that, because being from here, being able to see PNC Park’s energy, even before we took the field, the chants when we were on the line, that’s what it’s all about. We need to continue to earn that back.”

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