The Baltimore Ravens' defense was relentless in pressuring San Francisco 49ers quarterback Alex Smith when the teams faced one another during the 2011 season.5+ Pass-Rushers Since Week 11There's reason to expect different results during the teams' rematch in the upcoming Super Bowl.For starters, the 49ers have upgraded their offensive line at right guard. Their line has much more experience playing together. Also, that 2011 game was played in Baltimore, where the Ravens' home-field advantage complicated efforts to adjust pass protections.