Marcelo Mayer’s first major league home run was greeted by a chorus of boos as he rounded the bases at New York’s Yankee Stadium last week.

The 22-year-old rookie hammered both blasts to right field. The first one went 418 feet and left his bat at 108.7 mph. The second one went 410 feet with a 104.9 mph exit velocity. 2) As Mayer wore the Wally head in the dugout — as all Red Sox players do to celebrate their home runs — pitcher Lucas Giolito kissed both cheeks.

But he's not the only star rookie in Boston. The Red Sox previously called up shortstop Marcelo Mayer, the No. 8 prospect in the sport. And he broke out Wednesday night with two home runs in his first two at-bats against the Tampa Bay Rays.