Did you see the little white bag pitchers in MLB smack against their hands before a big pitch? The post From Screenprinter to MLB’s Rosin Bag King: How a Bay Area Man Became Baseball’s Exclusive ...

There were 28 pitchers who hit that mark as recently as 2015. None of this is stopping teams from dropping the bag for pitchers who have shown they can get outs efficiently. Max Fried just got an ...

But no one had done a scientific study on the differences in the rosin bags used by pitchers in the two leagues until now, according to Takeshi Yamaguchi, a tribology professor at Tohoku University.