Newcastle won a Premier League home game for the first time since October with a surprise victory over second-placed Manchester United.
Matt Ritchie scored the only goal in the second half as the Magpies climbed out of the relegation zone and left the visitors 16 points adrift of leaders Manchester City.
The Red Devils missed a string of chances to take something from a ground where manager Jose Mourinho is yet to win a league match.
But debutant Martin Dubravka was excellent in the Newcastle goal, denying Jesse Lingard, Anthony Martial, Ashley Young and Michael Carrick.
And the hosts could have had a first-half penalty when Chris Smalling tripped Dwight Gayle.
Defeat for Manchester United raises the prospect that Manchester City could be crowned champions at Old Trafford on 7 April.