Who could blame him? These aren't the "Not Ready for Primetime" Bengals of recent years, and clearly this isn't the same Dalton.
In last year's Thursday night matchup against the Browns, Dalton had a career-worst performance, with a 2.0 rating in a 24-3 loss.
But he delivered a steady performance Thursday night, going 21 of 27 for 234 yards and three touchdowns.
"A little different from last year, huh?" said Dalton, who improved to 4-7 in his career in primetime games.
With the victory, Cincinnati improved to 8-0 for the first time in franchise history.
"We don't get anything for that," said coach Marvin Lewis. "We've had to grind through. We've just got to do what we've done so far, take it one week at a time."
Receiver Marvin Jones led Cincinnati with five catches for 78 yards against a Browns secondary playing without cornerback Joe Haden and strong safety Donte Whitner, who are both injured.
But Cincinnati's defense sacked Manziel three times in the second half, during which the Browns (2-7) managed just 32 total yards.
"They came out and played a lot of cover two in the second half," said Manziel. "Things looked open a couple of times. But I could've gotten it down to a tight end or a running back. We had momentum going into the second half. We just didn't do enough."
Cincinnati figured to run the ball against the worst rush defense in the league, and the Bengals had 152 yards on the ground, led by running back Gio Bernard's 72.
On Cleveland's first possession of the third quarter, Manziel appeared to have gained 13 yards on third-and-12 from his own 10-yard line.
But a Cincinnati challenge overturned the spot.
The Bengals converted that decision into three points when a 28-yard field goal by Mike Nugent gave them a 17-10 lead.
The clinching touchdown came early in the fourth quarter when receiver Mohamed Sanu scored on a 25-yard reverse with Dalton among the lead blockers, making the score 24-10.
"That's my quarterback out there ready to block," said Sanu. "All I saw was green turf."
Cincinnati orchestrated a 10-play, 63-yard drive on its first possession.
After the Bengals converted on fourth-and-inches, Dalton passed to Eifert for a 9-yard touchdown pass, putting them ahead 7-0.
The Bengals blitzed often on the Browns' opening drive, forcing Manziel into a pair of third-and-long situations.
On its next possession, Cleveland used a quick-hit passing game to ease the pressure on Manziel and drove 71 yards, but all the Browns could manage was a 27-yard field goal by Travis Coons.
"I thought we competed well for a half," said Browns coach Mike Pettine. "Our mistakes just caught up to us. That's a good football team and they made more plays than we did."
Cleveland defensive end Desmond Bryant beat left guard Clint Boling and sacked Dalton to force a punt. But the Browns offense stalled again.
After the Browns held on fourth-and-2 at the 6-yard line, an offside penalty gave the Bengals a first down. Two plays later, Dalton and Eifert connected again, this time for a 2-yard touchdown making the score 14-3.
Manziel was 11 of 18 for 128 yards in the first half and capped off a 92-yard drive by finding Duke Johnson for a 12-yard touchdown pass with 19 seconds left in the half.
"I felt like I was chasing him all game," said Bengals defensive end Wallace Gilberry, of Manziel. "It felt good to get him on the ground."
Now, after notching two AFC North wins in five days, the Bengals get a break before hosting the Houston Texans on Monday, Nov. 16.
"We get a chance to lick our wounds," said Lewis.
NOTES: Bengals TE Tyler Eifert tied a club record with his ninth touchdown catch of the season. Eifert now leads all NFL tight ends in that category. ... Bengals RT Andre Smith (concussion) and LB Rey Maualuga (calf) were inactive. Eric Winston made his first start this season in place of Smith, and Vincent Rey started for Maualuga. ... Bengals LB Vontaze Burfict, who was active for the first time last week, started Thursday. ... Browns CB Joe Haden, who held Bengals WR A.J. Green to just eight catches in two meetings last season, and S Donte Whitner were inactive Thursday with concussions. Pierre Desir started in Haden's place and Ibraheim Campbell replaced Whitner.