Arsenal took revenge on Manchester United after beating them 3-2 in an exciting game at the Emirates Stadium with Nkitiah scoring the winning goal in the 90th minute.
Gunners and Red Devils took 3 points from each other this season with Rashford's goal that gave Nketiah the lead before Saka gave Arsenal the lead but Martinez equalized but in the 90th minute Nkitiah scored the winning goal.
Arsenal have regained their five-point lead in the Premier League with a game to play, while Manchester United are fourth, level on points with third-placed Newcastle.
Arsenal started the game fast and in fact they resisted Manchester United by getting 11 shots in the first half while United got 2. Also the Gunners touched the ball 22 times in the penalty area of United while the Red Devils only touched the ball five times. Arsenal penalty.
But it was Man United who took the lead when Marcus Rashford embarrassed Thomas Partey with a clever pass before curling a rocket past Ramsdale from outside the penalty area.
Manchester United's lead lasted just seven minutes after Xhaka's cross was headed in by Nketiah as Wan Bissaka fell asleep to follow the Arsenal forward.
The first half was tied with one goal and one goal, with coach Arteta replacing Ben White with Tomiyasu at half-time.
In the 53rd minute, Arsenal took the lead after Bukayo Saka stole the ball with a rocket that no one saw.
It is his seventh goal in the Premier League this season.
Three minutes later Man United came close to equalizing but Rashford's shot was brilliantly saved by Ramsdale.
In the 59th minute, Man United got the equalizer after a corner taken by Eriksen, Ramsdale headed in Lisandro Martinez to tie the game at 2-2.
In the 70th minute, Arsenal went on the brink of taking the lead again as Saka shot from the right wing again, and his shot at goal hit the bar before it went wide.
Arsenal put a lot of pressure on Manchester United by forcing them to defend in their penalty area while Arsenal looked for the winning goal.
The Gunners replaced Martinelli with new signing Trossard.
In the 84th minute, De Gea made a fantastic save as he denied Nketiah with a high ball.
In the 90th minute, Arsenal scored the winning goal after Nketiah scored from Martin Odegaard's pass. VAR checked the goal and confirmed the penalty.
The game ended 3-2 and Arsenal took revenge on Manchester United.