The game ended with Brentford in control, stroking the ball around on a slick surface and looking like the team most likely to win the game.
He was crowded out and a Pinnock shot was blocked.
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A Mata free kick was cleared by Charlie Goode but only as far as Greenwood.
Brentford ended the game with a 37.
Out of 1 previous meetings, Manchester United have won 1 matches while Brentford won 0.