MILWAUKEE - As hometown baseball fans celebrated a Brewers victory over the Chicago Cubs at American Family Field on Saturday, Oct. 11 , a mystery emerged.

Who is Mitch?

What we know:

With everything on the line in the National League Division Series against the Cubs, the Brewers pulled off a 3-1 victory before a sold-out hometown crowd. But the real grand slam was the sign right behind the plate. A sign that popped up frequently during the game read simply, "❤️ U MITCH."

It goes baseball fans, viewers, social media and FOX6 News wondering – who is Mitch?

What they're saying:

"He’s a fighter," said Christine Romasko, Mitch's wife.

FOX6 News found out Mitch Romasko is battling a rare blood cancer known as AML (Acute Myeloid Leukemia) . The 64-year-old has been in and out of

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