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MLB announces new features for 2020 season
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MLB's Ball Controversy Could Define the 2022 Season | Bleacher Report | Latest News, Videos and Highlights
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ローリングス)Rawlings MLB オフィシャルボール - | ローリングス(Rawlings) | ボール・ボールケース
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MLB study can't yet explain juiced ball theories
The 2022 MLB Baseball Has Higher Drag - Baseball ProspectusBaseball Prospectus
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Japan's Standardized Baseballs Are Popular With Pitchers - The New York Times
MLB lockout ends as MLBPA, owners reach CBA agreement: Five takeaways with baseball set to return - CBSSports.com
MLB | Official Info | MLB.com
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MLB labor dispute: Baseball appears headed for first work stoppage in decades
MLB reportedly used two different baseballs in games in 2021
News emerges MLB used 2 types of baseballs in 2021 as labor deadline passes : NPR
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MLBは"飛ばないボール"で投高打低に拍車 打率は1968年以降で最低、本塁打も激減 | Full-Count
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Nippon Professional Baseball Organization
