The Ravens have lost back up RB Matt Lawrence for the season due to a severe knee injury.  The 24-year old Lawrence played in 8 games for the Ravens this season and he carried the ball 4 times for 0 yards (0.0 ypc) and he also caught 1 pass for 4 yards.  Where the Ravens will likely miss Lawrence is on special teams as he had 8 tackles this year.  The Ravens have signed 25-year old fullback Charles Ali to replace Lawrence.  Ali played in 15 games for the Browns last season and he caught 4 passes for 13 yards (3.3 ypc).  Ali also made 2 tackles last season.