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When Boston Red Sox slugger David Ortiz belted out a game-winning homerun during Friday's home game against the New York Yankees, the crowd was ecstatic.

But no one was happier than a six-year-old boy in Wyoming named Maverick to whom Ortiz promised the big hit.

According to the The Boston Globe, Maverick has undergone more than 30 surgical procedures due to a congenital heart defect.

Former Red Sox first baseman Kevin Millar got to know him through the Children's Miracle Network Hospitals.

He and Ortiz sent a loving video to Maverick before the game, with Ortiz promising to hit a homerun just for him.

And he did it -- in the eighth inning, against Yankees relief pitcher Dellin Betances, widely considered one of the best in the league.

After the triumph, Maverick's parents sent back an elated video message from their son.

"Big Papi, you never let me down," Maverick said. "And you're the best player ever in the Red Sox game -- and I'm trying the hardest to get out there at Fenway Park and meet you."

Ortiz said Millar was crying when he showed him the video that Maverick had sent.

"It was very touching. And I start thinking about it right after, like, when I got home. That was when I really was like, 'Wow, I can't believe this really happened.' And Millar told me that his parents haven't seen him that happy in a long time. He has been very sick. I always say there's something special out there. I'm a huge believer in that."

It wasn't even the only remarkable promise delivered that game. Earlier, Yankees slugger Alex Rodriguez gave the bat he used to hit a homer to an eight-year-old fan whose father died from cancer.

According to ESPN, David Moss asked A-Rod if he could have his batting gloves.

"I told him, 'I need my gloves right now,'" Rodriguez said. "'But if I hit a home run, I'll give you the bat.'"

After touching home plate, Rodriguez recovered the bat and passed it off to the amazed boy.

"Now that kid might be a baseball fan for life,'' Rodriguez said.

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