MLB standardizes ball muddying process
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Pro Pitchers' Dirty Secret Rubbed On Every Ball : NPR
Memo - MLB to require all teams to 'muddy' ball using exact same
Famed N.J. mud used to rub up baseballs could be on the way out
After rubbing mud on baseballs for nearly a century, MLB is trying
MLB Has Tested Pre-Tacked Baseballs In Double-A This Season - MLB
MLB standardizing ball rubbing and removal from humidors - NBC Sports
MLB standardizing ball rubbing and removal from humidors - NBC
Major League Baseball has a sticky stuff enforcement problem
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After rubbing mud on baseballs for nearly a century, MLB is trying
Sports - Axios
After rubbing mud on baseballs for nearly a century, MLB is trying
Angels pitchers glad that MLB is looking into slick baseballs
MLB standardizes how baseballs are prepped to be put in play
