PITTSBURGH - Like their reputation for being a smash-mouth team, the Ravens' yearlong boasts about being a Super Bowl team were unmercifully laid to rest yesterday.

Unable to establish the run on offense or stop it on defense, the Ravens took a resounding shot to the gut in a 20-7 loss to the Pittsburgh Steelers before 64,227 at Heinz Field.

What survived this onslaught was the Ravens' playoff hopes, however faint they may be after losing for the fourth time in five games. A win by Buffalo (9-6) or Denver (9-6) - both of whom play at home and against teams with nothing to gain - would officially eliminate the Ravens (8-7) from the postseason on the final day of the regular season.

But unofficially, like their once-stout run defense, the Ravens' playoff aspirations were shredded yesterday.

"We've underachieved," Ravens defensive end Tony Weaver said. "We had high goals. Our goal was to go to the Super Bowl. Right now, our fate is not in our hands anymore.

"This one kills. There's no doubt. Anytime you come into a season like this and think about the players we have, to come out here and not perform up to those expectations, it hurts a lot."

These are the same wounds inflicted before by teams in the elite class of the Steelers (14-1), who won their 13th straight game to clinch home-field advantage throughout the AFC playoffs.

Once again, the Ravens continually drove into their opponent's territory only to come away empty nearly every time. Five trips inside Pittsburgh's 36-yard line produced a measly seven points.

Once again, the Ravens couldn't match the brute strength of a physical team, getting blown off the line of scrimmage. They allowed a season-worst 183 yards rushing, the fourth time they have given up more than 140 yards on the ground to a winning team.

All of these troubles have sabotaged a one-time 7-3 Ravens team, snowballing into the worst second-half collapse under coach Brian Billick's six-year watch.

Questions floated throughout the Ravens' locker room about their chemistry, their tackling and their offensive play-calling.

Linebacker Ray Lewis, the team's undisputed leader, exited the locker room without speaking to the media for the first time this season, leaving safety Ed Reed to make sense of a team unmistakably out of sync.

"We shouldn't be in this position," Reed said. "To shoot for the Super Bowl, it's going to come with conviction. To come back and do what we did, it's got to be humbling to you. Something needs to be corrected."

What needs to be corrected is the Ravens' history of playing winning teams for a half before falling apart in the second.

Right on cue, the Ravens, who were trailing 10-7 at halftime, found themselves on their heels from the opening drive of the third quarter.

Running 12 straight times - and primarily up the middle of the defense - the Steelers marched the length of the field to the Ravens' 2. Then, off a fake to running back Jerome Bettis, Pittsburgh's Ben Roethlisberger floated a short pass to uncovered tight end Jerame Tuman for the touchdown.

Although Roethlisberger hurt his ribs on a hit by Terrell Suggs on the play, the damage from that 8 1/2 -minute marathon drive had been done to the Ravens. It staked the Steelers to a 17-7 lead and paved the way for Bettis' 117 yards rushing, his first 100-yard game vs. the Ravens since 1997.

"I'm pretty frustrated," defensive coordinator Mike Nolan said. "It's always a physical battle [with Pittsburgh] and we always respond. We did not today."

It marked the fourth time that the Ravens had surrendered 100 yards to a running back this season. In their previous four seasons, they had only allowed seven backs to reach that mark.