FILE - In this June 6, 2015, file photo, a pile of batting practice balls is viewed during warmups prior to a baseball game between the San Francisco Giants and the Philadelphia Phillies in Philadelphia. Major League Baseball is experimenting with pre-tacked baseballs at some Triple-A games during the last stretch of the minor league season. The test run could be a step toward updating the big league balls after the league cracked down midseason on the use of illegal sticky substances used by pitchers to improve grip. (AP Photo/Chris Szagola, File)
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