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Oakland Athletics Marcus Semien Jersey and Gear

Show your support for this star player with authentic Oakland Athletics Marcus Semien jerseys and more. Shop the best selection of A's Marcus Semien apparel and gear from MLBShop.com. Proudly display your favorite player's number at the next game with official Marcus Semien t-shirts, jerseys, and more. Gear up with the newest additions of A's Marcus Semien merchandise from the official Online Shop of the MLB.