Center Marcus Martin, 20, is gearing up for his first NFL start.
Center Marcus Martin, 20, is gearing up for his first NFL start. Damian Dovarganes AP
Center Marcus Martin, 20, is gearing up for his first NFL start. Damian Dovarganes AP
49ers with Matt Barrows

49ers with Matt Barrows

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Quick study: Marcus Martin preparing for showdown with Rams defensive front

October 29, 2014 01:52 PM