Daily Recap: Marcus Semien and Khris Davis each homered to back Mike Fiers and the A's bullpen in the Opening Day shutout against the Angels About Major League Baseball: Major League Baseball (MLB) is the most historic professional sports league in the United States and consists of 30 member clubs in the U.S. and Canada, representing the highest level of professional baseball. Led by Commissioner Robert D. Manfred, Jr., MLB currently features record levels of labor peace, competitive balance and industry r
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