The Washington Commanders have placed quarterback Marcus Mariota on the injured reserve list and have signed rookie Sam Hartman from the practice squad, the team announced. Mariota has been dealing with an upper body injury, and missed his second-straight practice on Friday, giving Hartman a chance to suit up for Washington on Sunday against the Tampa Bay Buccaneers. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! Elsewhere on the roster, the Commanders also elevated linebacker Nick Bellor and defensive tackle Sheldon Day alongside Hartm…