But Sagbo turned villain on his home debut when he was shown a straight red card for an apparent head-butt on Russell Martin off the ball – a decision that enraged Hull boss Steve Bruce.
Nathan Redmond was Norwich’s standout player and the 19-year-old midfielder was unlucky not to level when he saw a 25-yard free-kick brush the outside of the post in first half stoppage time.
Norwich dominated long periods of the second half but the closest they came was a thumping Ricky van Wolfswinkel header that was brilliantly tipped over by goalkeeper Allan McGregor.
But Hull survived the onslaught to secure that all important first win, while Norwich remain without a victory from their opening two games.
PRE-MATCH: Huddlestone and Livermore start for Hull, Sagbo makes his home debut: The pair from Tottenham made an impact from the bench against Chelsea and are both handed starts in the heart of the Tigers’ midfield.
3’ – NORWICH CHANCE: Great early opening for Norwich as Fer nods Whittaker’s cross inches wide of the far post.
15’ – NORWICH CHANCE: Redmond lashes an effort at goal from 25 yards, but McGregor makes a flying save to his right.
22’ - HULL GOAL: Brady sends Ruddy the wrong way from the spot after Turner dragged Sagbo to the ground.
27’ - RED CARD: Referee Mike Jones wastes no time in awarding a straight red card to Sagbo, who appears to head-butt Russell Martin.
45’ - NORWICH HIT THE POST: Redmond’s free-kick from 25 yards clears the wall but brushes the outside of the post, just on the stroke of half time.
67’ – MCGREGOR DENIES VAN WOLFSWINKEL: Norwich’s best chance of the game. Van Wolfswinkel climbs high to send a brilliant header at goal, but McGregor pulls off an outstanding fingertip save.
TALKING POINT: The red card to Sagbo threatened to swing the game Norwich’s way, but it proved not to be the game-changer it could have been. TV replays suggested a head-butt, although it was not clear cut.
Norwich have now won just five points (W1 D2 L8) from their last 11 away games in the Premier League.
The Canaries have now won just one of their last eight competitive games against Hull City.
Chris Hughton’s side have kept a clean sheet in just two of their last 53 Premier League away games.
MAN OF THE MATCH
Curtis Davies (Hull City) – Faultless display at the back by the centre-back. Organised the back four impressively and kept the dangerous Van Wolfswinkel quiet.
Hull City: McGregor 8, Elmohamady 6, Figueroa 7, Davies 9, Chester 7, Huddlestone 8, Livermore 7, Koren 6, Brady 7, Aluko 7, Sagbo 5; Subs: Graham 6, Rosenior N/A, Boyd N/A
Norwich City: Ruddy 6, Martin 6, Johnson 6, Turner 7, Howson 6, Van Wolfswinkel 7, Fer 6, Garrido 6, Redmond 7, Tettey 6; Subs: Snodgrass 6, Elmander 7, Hoolahan 6.
THE MATCH IN A TWEET