Suspicious goo on pitcher's mitt?

It's a tradition as old as the national pastime itself – pitchers using any substance they can to doctor a baseball.

But it was a lot easier to spit a glob of tobacco juice on the ball when the only footage available showed Babe Ruth running really, really quickly around the bases.

Last night, as Red Sox starter John Lester was filleting the Cardinals in game one of the World Series, a minor league pitcher in the Cardinals system noticed something suspicious inside his mitt, and tweeted out a photo.

His tweet has since been deleted, but a Vine video caught him rubbing the spot where the "possibly suspicious" goo was.

Major League Vaseball responded to CNN saying, "There were no complaints from the umps or cardinals... And you can't draw any conclusions from the video."

Lester told the Associated Press there was only rosin — which is legal — on his glove.