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Alameda, Calif. — Oakland Raiders rookie quarterback Derek Carr avoided a serious rib injury from a hard hit that knocked him out of an exhibition game against the Detroit Lions.

Coach Dennis Allen said Saturday that X-rays on Carr’s ribs were negative and he is feeling much better than he did immediately after the injury.

Carr also suffered a concussion on the hard hit by Larry Webster on Friday night and must pass the league protocols before he is able to return to practice this week.

Carr played well in his second pro game, completing 9 of 16 passes for 109 yards and a touchdown, leading three scoring drives and committing no turnovers. He even got one series with the first-team offense.

“I did see a lot of improvement,” Allen said. “I saw some improvement in his accuracy, I saw some improvement in his reads, I saw some improvement on his touch passes.

I think that’s a positive sign. There’s still obviously a lot of room for improvement and room for growth, but I did see him take a step forward from his first preseason game.”

Despite the strong performance, Carr is not expected to get more time with the starters in the dress rehearsal game at Green Bay on Friday.

Saturday’s exhibition games

Packers 21, (at) Rams 7: Michael Sam waited a while longer to get back on the field in his second preseason game. When he did, he made a bigger impact in a bid to bolster his case for a spot on the St. Louis Rams’ roster.

Sam, the NFL’s first openly gay player drafted in the NFL, raced around tackle Derek Sherrod to flatten Green Bay quarterback Matt Flynn in the fourth quarter of the Rams’ loss to the Packers on Saturday for his first sack.

“Finally. I finally got that under my belt, so it feels good,” Sam said.

The marquee attraction heading into the game for St. Louis was the return of another Sam — quarterback Sam Bradford, who was sidelined for much of last season after knee surgery.

Bradford played the first two series, throwing an 11-yard touchdown pass to Lance Kendricks and popping right back up after taking the first hit of his return from behind by Julius Peppers.

Counterpart Aaron Rodgers, also making his exhibition debut, was 11 for 13 for 128 yards and a 3-yard score to Randall Cobb. He also had another TD pass called back by a penalty and the Packers, who never trailed, settled for a Mason Crosby field goal instead.

Ravens 37, (at) Cowboys 30: Deonte Thompson returned a kickoff 108 yards for a score after Dallas’ Tony Romo threw a touchdown pass in his first game since back surgery last season, and Joe Flacco led three scoring drives in Baltimore’s victory.

The Ravens (2-0) also got a 26-yard fumble return for a touchdown when Courtney Upshaw picked up a botched handoff from Romo and stayed on his feet while Romo tried to drag him down by his jersey.

Romo’s final play was a 31-yard touchdown pass to Dez Bryant midway through the first quarter.

(At) Steelers 19, Bills 16: Ben Roethlisberger threw two touchdown passes in less than a half of work for Pittsburgh. He hit Antonio Brown for a 76-yard score on Pittsburgh’s second play from scrimmage and found Markus Wheaton for a 16-yard strike to help the Steelers win an exhibition game for the first time in nearly two years. Roethlisberger finished 8 of 11 for 128 yards and the two scores. Shaun Suisham’s 20-yard field goal as time expired ended Pittsburgh’s five-game losing streak in exhibitions.

EJ Manuel completed 17 of 27 passes for 148 yards and an interception while playing the entire first half for Buffalo (1-2), but the Bills’ starting offense failed to reach the end zone for the third straight game.

Bills rookie wide receiver Sammy Watkins left early in the first quarter with a rib injury. The former Clemson star did not return.

The fourth overall pick in the draft walked off the field clutching his side during Buffalo’s first drive after Steelers rookie linebacker Ryan Shazier jumped over him while attempting to break up a pass attempt.

Giants 27, (at) Colts 26: Ryan Nassib led New York to two touchdowns in the final four minutes, completing a huge fourth-quarter comeback. New York trailed 26-0 early in the fourth, but the Colts couldn’t hold on.

Indy (0-2) had a chance to win it with Pat McAfee’s 64-yard field goal with 5 seconds left, but the kick went wide left.

Andrew Luck was 12 of 18 for 89 yards. Eli Manning was 1 of 6 for 7 yards for New York (3-0).

Dolphins 20, (at) Buccaneers 14: Backup quarterback Matt Moore led Miami on two touchdown drives. The Dolphins also took advantage of a mistake by Bucs rookie Mike Evans, who caught a short pass from Mike Glennon in the second quarter and after breaking a tackle, sprinted down the sideline toward a 42-yard touchdown which could have given the Bucs a 14-3 lead. After a review of the original touchdown call, however, it was ruled that Miami cornerback Brent Grimes had punched the ball out of Evans’ hands just before Evans crossed the goal line. The fumble went through the end zone, giving the Dolphins (1-1) the ball.

Jets 25, (at) Bengals 17: Andy Dalton completed all eight of his passes and led the Bengals to a pair of touchdowns and a field goal during three impressive series. It was Dalton’s first game at Paul Brown Stadium since his turnover-filled 27-10 loss to San Diego in the opening round of the playoffs. Also, his first home game since he signed a six-year contract extension. He went 8 for 8 for 144 yards, one touchdown and a perfect passer rating of 158.3. The Bengals (0-2) rolled up 173 yards while he was in the game.

With their starters on the field, the Jets (2-0) had another bad day at Paul Brown. Their injury-depleted secondary made it easy for Dalton.

In an experiment, they moved safety Antonio Allen to cornerback and had him cover A.J. Green.

It didn’t go well at all — Green caught three passes for 69 yards, including a 35-yard catch after he pulled away from Allen down the sideline.

(At) Texans 32, Falcons 7: Jadeveon Clowney made big hits behind the line on consecutive plays and Ryan Fitzpatrick threw a touchdown pass to DeVier Posey in the Houston’s win over Atlanta.

Clowney, the top overall pick in the draft, smacked down Atlanta’s Antone Smith for a 2-yard loss and then sacked Matt Ryan on the Falcons’ second series.

Jonathan Grimes returned a blocked punt for a touchdown and Andre Hal returned an interception 64 yards for another score for the Texans (1-1), who showed significant improvement after last week’s 32-0 loss in Arizona.

Left tackle Sam Baker was carted off the field in the second quarter with a right knee injury for the Falcons (1-1). Baker, who started 16 games in 2012, played in just four games last season because of a left knee injury that required surgery in November.

(At) Vikings 30, Cardinals 28: Teddy Bridgewater gave the giddy fans chanting his first name a pair of go-ahead touchdown throws to cheer for in the fourth quarter, giving the Vikings a victory over the Cardinals.

Bridgewater floated a back-shoulder fade pass from 2 yards out to Rodney Smith with 18 seconds remaining for the lead, after the Cardinals had gone ahead on a bizarre fourth-down score about a minute earlier.

On that final drive, Bridgewater completed six of seven passes for 77 yards. The first-round draft pick from Louisville, who finished 16 for 20 for 179 yards, found Allen Reisner for a short touchdown and Jarius Wright for the 2-point conversion with 7:57 left.

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