Marcelo Mayer’s first MLB home run occurred during a forgettable game at Yankee Stadium Friday night.

The Red Sox rookie smacked a 410-foot solo homer to right-center field in front of 46,783 fans in the Bronx, a moment that should have been visibly thrilling for Mayer and his teammates.

Except, the 22-year-old’s first long ball cut the Yankees’ lead from 7-0 to 7-1 in the fifth inning. Mayer’s teammates were happy for him, high-fiving him as he donned the celebratory Wally the Green Monster helmet for the first time, but the celebration was subdued due to the score.

“It was a good feeling,” Mayer told reporters after the game. “Obviously it kind of sucks when you’re losing, but it’s definitely a moment I’ll remember for the rest of my life.”

He also said he feels like he’s improvi

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