In spring training in 2013, Maurer competed with Erasmo Ramírez, Jeremy Bonderman, and Blake Beavan for one of the final two spots in the Mariners' five-man starting rotation, behind Félix Hernández, Hisashi Iwakuma, and Joe Saunders.
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Maurer played for the school's baseball team, which competes in the Trinity League, within the Southern Section of the California Interscholastic Federation.
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