MLB's Marcell Ozuna Honors Chadwick Boseman In 3-HR Game, 'Wakanda Forever'

Touching tribute from Atlanta Braves star Marcell Ozuna ... the OF flashed a "Wakanda Forever" arm sign in the middle of his historic game Tuesday -- all to honor the late Chadwick Boseman.

The scene at Fenway Park was pretty moving ... while Ozuna was rounding the bases after his 3rd home run of the game, he crossed his arms and pointed to the sky to pay respects to Boseman, who tragically died last week after a battle with colon cancer.

The gesture was particularly meaningful given how HUGE of a night Ozuna was having ... Marcell became the first National League player EVER to hit 3 HRs at Fenway.

Ozuna also added 6 RBI in the game ... as the Braves pounded the Red Sox, 10-3.

Of course, many others across the sports world have paid similar tributes to Boseman with the iconic "Black Panther" gesture ... LeBron James just did it before the Lakers' game Sunday.

"It actually felt like we had our black superhero and nobody could touch us," LeBron said of Boseman. "To lose that, it's sad in our community."