PITTSBURGH - A most fitting comeback for Ben Roethlisberger.

The Steelers quarterback connected on a 58-yard pass to rookie Antonio Brown with less than two minutes to go that ended any ideas the Ravens had of finally winning a playoff game against their division rivals.

Four plays later in the rough-and-tumble matchup, Rashard Mendenhall scored from 2 yards out with 1:33 left to lift the Steelers to a 31-24 victory over the error-prone Ravens in Saturday's AFC divisional playoff game.

Just before his biggest pass of the season, Roethlisberger said he told offensive coordinator Bruce Arians, "Let's send him. Let's just chuck it deep. If they pick it, it will be a pick way down there, just as good as a punt. ... I just throw it as far as I can.' "

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He did. Brown made the biggest catch of his life, and the Steelers (13-4) are a win away from their third Super Bowl in six seasons. The Steelers play the winner of Sunday's game between the New York Jets and New England Patriots.

Roethlisberger took his shots early from the Ravens' defense, but threw for 226 yards and two touchdowns before his big pass on third-and-19.

"He may not be Brady or all those other guys, but when I see him in the huddle I know we've got a chance to win," said Hines Ward, who caught a TD pass. "He's a proven winner. And history shows he's a proven winner against Baltimore."

The third meeting this season between these AFC North rivals had the usual skirmishes, but also was filled with penalties and turnovers.

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It's been a rugged season for the Steelers' quarterback. His life and reputation was in tatters 10 months ago following sexual assault allegations that weren't prosecuted. He was suspended for the first four games of the season, and helped his team finish with 12 victories and a first-round bye.

"It's Ben. You give this guy an opportunity to snap it; he's capable of producing plays," Steelers coach Mike Tomlin said, "It's not always how you draw it up, but he has a no-blink mentality. He is a competitor and a winner. And those guys follow him."

While the Steelers trailed by two TDs at the half, it was the Ravens who fell apart in the in the second half as the team they love to beat most came back to knock them out of the postseason. The Steelers are 9-0 against division teams in the postseason.

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Roethlisberger went deep down the depth chart to find Brown, only the eighth leading receiver for Pittsburgh.

"It was kind of amazing," Brown said. "It kind of stuck to my shoulder."

The loss will stick with the Ravens for seasons.

The Steelers were trailing 21-7 after turnovers created two Ravens touchdowns. But they came back with the help of three Baltimore turnovers in the third quarter. It was so bad, the Ravens' minus-4 yards in offense wasn't the worst of it; they ended with 28 yards in the second half.

"We knew we had to play great; we knew if we didn't play great we were going to lose this game," defensive end Brett Keisel said.

Baltimore was outgained 263-126 as Joe Flacco was 16 of 30 for 125 yards as the Ravens became the eighth team in NFL playoff history to fail to gain at least 100 yards in the first three quarters. All eight teams lost.

The Ravens' last chance to beat the Steelers — they haven't in three postseason tries — ended when T.J. Houshmandzadeh dropped Flacco's fourth-down pass at the Steelers' 38 with 1:03 remaining.

"We knew it would be a close game," Houshmandzadeh said ."I didn't think it needed to be, but it was."

Failing to protect the ball cost the Ravens — even after they scored two touchdowns in less than 30 seconds in the first half. Defensive end Cory Redding returned a Roethlisberger fumble for a touchdown that both teams thought was an incompletion, but that wasn't nearly enough on a day when the Ravens offense did so little.

"What better way to put the Ravens out of the tournament," Steelers wide receiver Hines Ward said. "They keep asking for us and we keep putting them out of the tournament. They're going to be ticked about this for a long time."

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With Baltimore up 21-7, Ryan Clark forced a rare fumble by Ray Rice on a screen pass, and LaMarr Woodley recovered at the 23. The play re-energized the crowd of 64,879 that had grown silent as Baltimore opened its two-TD lead.

"You know what, our offense went in there (at halftime) and said, 'We played terrible, we gave them the ball in prime position too many times,' " Roethlisberger said. "We had to do something about it."

Mendenhall ran for 14 yards before Roethlisberger's 9-yard scoring pass to Heath Miller, who missed two games after sustaining a concussion on a hit by Jameel McClain during the Steelers' 13-10 win in Baltimore last month.

Later in the quarter, Flacco overthrew tight end Todd Heap, and Clark returned the interception 17 yards to the 25. Three plays later, Roethlisberger found ol' reliable Ward, absent in the offense most of the day, for an 8-yard touchdown pass and it was tied at 21.