Vaughn Grissom wasn’t wearing a Red Sox uniform when he played his first game at Fenway Park.

In fact, he still hasn’t. He began the season on the injured list with a groin strain, but is slated to begin a rehab assignment this weekend. Currently, the plan is for him to be the designated hitter on Friday, then play second base on Sunday.

But on Aug. 10, 2022, when he made his Major League debut in Boston, he was a 21-year-old Atlanta Braves prospect. That’s why he had an idea of how Jackson Holliday felt before his own debut on Wednesday.

“I get to watch him debut where I debuted, so this is exciting,” Grissom told the Herald before Wednesday evening’s contest.

Selected by first overall by the Baltimore Orioles in the 2022 June draft, Holliday is MLB’s No. 1 overall prospect. That he’s the son of 15-year MLB veteran Matt Holliday, a seven-time All-Star, four-time Silver Slugger, and 2011 World Series champion, only heightens the pressure. (The elder Holliday was also on the ’07 Rockies and ’13 Cardinals when they fell to the Red Sox in those World Series.)

Grissom hoped to get a chance to speak to the fellow middle infielder before the game, but decided to find a quieter moment. “I’m in a similar situation as him,” he explained, “But I wanted to let him get his work in and I don’t want to distract him at all.”

He’d planned to offer Holliday some advice, from one young, middle infielder making their debut at America’s Most Beloved Ballpark to another.

“I definitely wanted to let him know it’s the same game, and slow it down and whatnot,” Grissom said, “and just be who you are, because I’m sure we’re gonna see tonight, he’s a good ballplayer. I just want him to do what he’s capable of.”

His own debut was “a dream.”

“It was awesome,” Grissom recalled. “I was (in) like, a dreamlike state.”

He hopes Holliday will be able to enjoy his, too, though not as much as he did, he joked. In Grissom’s debut, he became the youngest player in modern MLB history to homer – a towering shot over the Green Monster, no less – and steal a base in his first career game.

“I was gonna tell him, if you hit a home run, do not (expletive) steal, because that record’s mine,” he said with a smile. “Maybe you can steal but not hit a homer… He needs to pick one thing he wants to do, but he can’t do ’em both, that’s me.”