After three straight games allowing a hundred-yard rusher, including Shawn Alexander's 172-yard performance Sunday, Titans Head Coach Jeff Fisher said most of the damage has been on big plays.

''The thing that broke our backs yesterday defensively were the big plays,'' Fisher said. ''We've got to do a better job beating one-on-one blocks. Everybody's got a responsibility...there comes a point when you get off the block and make a play.''

Fisher said that other than long runs, the defense did well in stopping the grind-it-out yardage when trying to stop the ground game.

''We did (stack the line) at times,'' Fisher said. ''They did a good job at times of mixing their personnel...I think where you get frustrated in the run defense is when you're giving up six and seven yards a crack and you just can't stop them. We had some stops, we had some wins.''

Fisher acknowledged that certain long runs can be attributed to, ''cutbacks, missed tackles, safety position. You've got a free safety in the middle of the field, it's his job to go make the tackle.''

Despite miscues in the secondary, Fisher believes that run defense starts up front.

''Lamont (Thompson) is making a lot of plays for us,'' Fisher said. ''He's still running and saving touchdown runs, but it starts up front. He doesn't necessarily have a gap fit. He has a responsibility to get someone down, as does Tank (Williams). I'm not faulting them or putting the difficulties of the run defense on the safeties. It starts up front.''

Regardless of specific problems stopping the run, the Titans will spend this short week preparing all defensive phases for Miami's attack.

''We've missed tackles, had poor angles and a number of things, so this week is certainly going to be a challenge,'' Fisher said. ''It will be a good week to get all of that stuff fixed.''