During Game 3 of the wild-card series against the Red Sox, 48,833 fans witnessed Cam Schlittler’s outstanding performance, as the rookie right-hander delivered eight scoreless innings, propelling the Yankees into the ALDS.

Among those who relished the victory was Matt Hyde, the team’s scout for the Northeast region. He initially discovered Schlittler at Northeastern University in Boston and then watched him lead the Yankees to a 4-0 triumph over his hometown Red Sox at Yankee Stadium.

“He was incredible,” Hyde remarked outside the Yankees clubhouse after speaking with Schlittler. “Unbelievable. He rose to the occasion, and it was a thrill to watch. A dream come true.”

The Yankees drafted Schlittler in the seventh round of the 2022 amateur draft and after impressing during spring training, he opened this season at Double-A Somerset.

He quickly moved up to Triple-A Scranton/Wilkes-Barre before making his MLB debut July 9.

And while he has mostly wowed ever since, he’s never been better than Thursday night at the Stadium.

“Especially to do it against Boston was amazing,’’ Hyde said. “It was fun to watch a guy you’ve seen since he was an amateur player get on that stage and do everything you hoped they would do at some point in their life, you know?”

That included Schlittler becoming the first pitcher in MLB history to pitch at least eight scoreless innings, strike out at least 12 batters and not walk anyone. He also set the franchise record for most strikeouts in a postseason game.

And he gave up just five hits — all singles — in his 107-pitch masterpiece.

Schlittler was at 89 pitches after six innings, when Fernando Cruz was up in the bullpen.

He finished the seventh at 100 pitches — and still, Aaron Boone kept him in the game in the eighth, which he also finished.

As it was happening, Hyde hoped Schlittler would continue to shut down the Red Sox.

“In that situation, I’m a fan,” Hyde said. “So I’m saying, ‘Keep going after it.’ He was looking so good.”

The righty, a native of Walpole, Mass., finally left the game to a loud ovation after the top of the seventh.

“It was so much fun to watch,’’ Hyde said. “Against Boston, in a big game with a playoff atmosphere at Yankee Stadium. He didn’t shy away from it. I kept watching him coming back to the dugout, keeping his head down and going about his business.”

It’s what the 24-year-old has done throughout his brief major league career.

And the boost he provided to the rotation when he arrived at midseason took another huge step in October, as he threw 11 pitches at least 100 mph.

“Especially with the Yankees, people want to go trade for guys and get big free agents,” Aaron Judge said. “But when you’re able to develop a guy like Cam through the minor league system, it’s special.”