The effort was straight at Krul, but almost went through the Newcastle keeper's legs.
Fletcher went close to a second in the 17th minute when he latched onto Jozy Altidore's flick on and let fly with a half volley from 20 yards.
Cabaye fired just wide from 20 yards in the 63rd minute after collecting Ben Arfa's lay off from the left.
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Hatem Ben Arfa let fly with a free kick from 35 yards in the 38th minute, but although he made decent contact, it drifted high and wide of Westwood's goal.
Tim Krul managed to push it away low to his right, with Altidore unable to control the rebound after nicking it away from Dummett.
Johnson lifted the ball into the six yard box and Steven Fletcher got above Dummett to head home.
Yohan Cabaye tried his luck in the 11th minute with a shot from 25 yards which was always rising over the top.
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and Fabricio Coloccini failed to shake off injuries.
Borini's long effort effort six minutes from time secured a perfect home debut for new Sunderland boss Gus Poyet, as the Black Cats moved off the Premier League's basement.
Steven Fletcher had given Sunderland an early lead when he got above Newcastle debutant Paul Dummett to head home Adam Johnson's cross.
Magpies boss Alan Pardew made a change at the interval with Papiss Cisse replacing Moussa Sissoko.
Sunderland 1 Newcastle 0
Fabio Borini entered the field in the 69th minute and almost scored with his first contribution as he shrugged off the challenge of Debuchy and fired in a low shot from a narrow angle on the left hand side of the area.
Substitute Shola Ameobi fired inches wide of the far post in the 78th minute after turning 20 yards out and unleashing a right footed shot across goal. Subs not used: Elliot, Haidara, Anita, Obertan, Sammy Ameobi. Booked: Under Armour Shoes Camouflage Cabaye (28)This website and its associated newspaper adheres to the Press Complaints Commission's Code of Practice. If you have Under Armour Black Basketball
Seb Larsson fired one over the top from 20 yards four minutes later after Jack Colback had laid Johnson's corner back into his path.
Sunderland got off to the perfect start after breaking the deadlock in the fifth minute.
Newcastle made just one change from the side which drew 2 2 against Liverpool, with debutant Paul Dummett replacing the suspended Mapou Yanga Mbiwa at centre half after both Steven Taylor Under Armour Shoes Basketball
Adam Johnson played a short corner with Seb Larsson and received a return ball from the Swede on the right hand touchline.
The Magpies drew level with their first effort on target in the 57th minute when Ben Arfa delivered a cross come shot from the left.
Report Sunderland 2 Newcastle 1
Carlos Cuellar replaced Valentin Roberge at centre half, Jack Colback came in for Craig Gardner in central midfield and Jozy Altidore partnered Steven Fletcher up front.
The ball went right across the face of Sunderland's goal before Mathieu Debuchy got away from the dozing Johnson and tucked it away at the far post.
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