NEW ORLEANS — Sean Payton’s return to the sideline is one game old and already the Saints are celebrating a dramatic victory over a presumed title contender.
Drew Brees passed for 357 yards and two scores, Roman Harper intercepted Matt Ryan’s tipped fourth-down pass in the end zone, and New Orleans held on for a 23-17 victory over the Falcons on Sunday.
‘‘I was hoping our defense would pull one out, and man, did they ever,’’ Brees said.
Last season, while suspended in connection with the NFL’s bounty probe, Payton watched helplessly from afar as the Saints fielded one of the worst defenses ever, yielding an NFL single-season record 7,042 yards. One of his first moves upon reinstatement was to hire Rob Ryan as defensive coordinator.
Payton put the new product on the field right away, electing to kick off when the Saints won the coin toss.
‘‘Sean sent the defense out first, which you would never have seen in the past,’’ Harper said. ‘‘So just a whole different feel and the things that we’re trying to accomplish, this is just one step in the right direction.’’
Brees’s first touchdown went to Marques Colston, who made a diving, 25-yard snag for his 533d catch, setting a franchise record.
‘‘That’s just vintage Marques Colston,’’ Brees said. ‘‘I have so much trust and confidence in him. He knows the ball’s coming to him and he’s going to make that play.’’
Brees also hit tight end Jimmy Graham for a 7-yard score in the third quarter to give the Saints the lead for good.
‘‘It was just important to get the first win,’’ Payton said. ‘‘You try to compartmentalize each week, each game, and we played a good team . . . We fought hard, especially late.’’
Atlanta’s Ryan passed for 304 yards and touchdown passes to Tony Gonzalez and Julio Jones. In the final three minutes, Ryan quickly drove Atlanta to the Saints’ 3 before the New Orleans defense stiffened.
‘‘When we play the Saints, it’s usually hard-fought, and it turned out that way again,’’ Atlanta coach Mike Smith said. ‘‘We have to protect the quarterback a lot better.’’
Steven Jackson rushed 11 times for 77 yards in his Atlanta debut, including a 50-yard run.
New Orleans’s defense gave up two 50-yard plays, the other on Harry Douglas’s reception, but also produced pressure regularly. Ryan was sacked three times — by Junior Galette, Akiem Hicks, and Parys Haralson — and threw balls away several times, including on an early third down that forced Atlanta to settle for a field goal.
The group also produced a momentum-changing turnover when Malcolm Jenkins stripped Jones and Harper recovered, setting up Colston’s TD, which tied the game at 10 in the second quarter.
Colston had five catches for 68 yards. Darren Sproles caught six passes for 88 yards.
Douglas caught four passes for 93 yards, including a 20-yarder to the New Orleans 7 on Atlanta’s final drive. But that turned out to be Ryan’s last significant completion on a drive that started with connections of 17, 16, 7, and 13 yards.
On third and goal, Ramon Humber broke up a pass for Jackson at the goal line.
‘‘I dropped the ball,’’ Jackson said. ‘‘It wasn’t the easiest catch, but I'm not a person to make excuses.’’
Then rookie safety Kenny Vaccaro tipped Ryan’s fourth down pass for Gonzalez in the end zone and Harper dived to catch it before teammates piled on him while the Superdome crowd erupted.
‘‘I liked my chances, but we were just a fingertip away,’’ Gonzalez said.