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Eugene Monroe: A
PFF Grades: Overall (+21.2), Pass Block (+13.3), Run Block (+4.0), 21 QB pressures allowed (3 sacks)
Eugene Monroe was brought over midseason and established himself as the best lineman on the team. He was excellent in pass protection and locked down Flacco's blind side. He was less dominant in the run game, but even in that regard he was one of the best linemen on the roster.
There were, of course, a few missed assignments, but Monroe was brilliant for Baltimore. General manager Ozzie Newsome's first priority of the offseason is to keep Monroe in a Ravens jersey.
A.Q. Shipley: D-
PFF Grades: Overall (-20.6), Pass Block (-5.8), Run Block (-13.1), 21 QB pressures allowed (1 sack)
Shipley was put in a tough spot when he was asked to fill in for Kelechi Osemele. You can see why he was a backup.
His natural position is center, and he struggled mightily at guard. He frequently got outmuscled at the line of scrimmage and was terrible in the rushing game.
Kelechi Osemele: D+
PFF Grades: Overall (-4.9), Pass Block (-3.1), Run Block (-0.7), 17 QB pressures allowed (0 sacks)
Osemele was expected to be one of the best young guards in the game, but he struggled in the few games he played in 2013. Part of that may be due to the back problems that ended his season early.
We'll give Osemele the benefit of the doubt and bump him up to a D+, but he didn't play well and was not physically effective in the ground game when he did play.
Gino Gradkowski: F
PFF Grades: Overall (-20.5), Pass Block (-14.6), Run Block (-7.7), 34 QB pressures allowed (3 sacks)
The coaching staff was impressed by Gradkowski's development during his rookie year and training camp, but the center was terrible for the Ravens.
He was ProFootballFocus' worst-rated center this season (subscription required), and his inability to make calls at the line of scrimmage was a huge reason for the offensive line's struggles.
Marshal Yanda: B
PFF Grades: Overall (+9.2), Pass Block (+4.5), Run Block (+4.9), 25 QB pressures allowed (2 sacks)
Marshal Yanda made the Pro Bowl, but that was more the result of his previous accomplishments than his performance this season.
Yanda came on strong to end the year, but he wasn't his normal dominant self. He was routinely beaten and looked lost at times.
Michael Oher: F
PFF Grades: Overall (-14.4), Pass Block (-0.1), Run Block (-17.6), 49 QB pressures allowed (8 sacks)
Michael Oher is a free agent this summer, but he didn't help his stock at all with his 2013 performance. He was abysmal as a run-blocker and struggled with penalties all season.