CLEVELAND — Rock on, bat boy.

Nate Rosenhaus, the drummer who is doubling as the Yankees’ bat boy during their series against the Guardians this week at Progressive Field, went viral on social media during the first two games of the series for his long blond hair, and Yankees first baseman Anthony Rizzo is hoping Rosenhaus parlays his newfound popularity into a big break for his band, The Open Doors.

The flow was an unusual look for someone wearing a Yankees uniform, given the club’s strict grooming policy, and Michael Kay playfully called Rosenhaus out for it during Monday’s YES Network broadcast.

The policy does not apply to Rosenhaus since he is employed by the Guardians and serves as the visiting clubhouse assistant.

Kay joked that Rosenhaus was “disobeying” two Yankees rules with his hair below the collar and facial hair.

During Tuesday’s game, Rosenhaus’ long locks were briefly tucked into his helmet.

Rosenhaus — who “respectfully declined” an interview request on Wednesday morning, one of many he has received over the last 24 hours — caught some sarcastic flak for his long hair, but it has seemingly turned into some good publicity for his band.

“Good, I hope it does,” Yankees first baseman Anthony Rizzo said Wednesday.

Earlier in the series, Rosenhaus told Rizzo that he was in a band, The Open Doors, and had T-shirts for it.

Rizzo said he would take one, which led to the two posing for a picture with both wearing The Open Doors T-shirts.

Rizzo said he was aware of the buzz Rosenhaus was getting on social media, and “thought he was great” about any good-natured ribbing that came his way.

“He had fun with it and told me he was in a band,” Rizzo said.

“So I listened to some of his music,” he added, giving it a positive review.

Yankees fans may get the chance to do that in person later this season.

Want to catch a game? The Yankees schedule with links to buy tickets can be found here.

Rosenahus took to Twitter on Wednesday to ask, “If we played in Brooklyn would the Yankee faithful come see a show?”

The early response was overwhelmingly positive.

“Hey guys I really appreciate the support it means a ton to me and the whole band!” Rosenhaus wrote on Twitter, with a link to streaming sites that host the band’s music.

In the meantime, the band has gone from 300 followers on Instagram before this series to nearly 1,400 by first pitch in the series finale on Wednesday.

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