Despite giving it everything, Hayes & Yeading's youngsters suffered 95th minute heartbreak as Corinthian-Casuals breached the United defence with pretty much the last kick of the game.
The visitors were very quickly into their stride and with just 24 seconds on the clock Braiee Omondi outpaced the United defence from the halfway line only to fire wide as Lewis Lavin came off his line to block his path to goal and then five minutes later the same player was played in by Ralfi Hand, the strikers spin and shot being well saved by Lavin low down.
United's first march towards the Casuals goal came in the 13th minute when an excellent curling pass from Ben Bell saw Harley Sells chase the ball however Casuals 'keeper Reginald Rose was alert and got to the ball first to volley clear.
Despite the visitors holding the balance of possession, United did create openings of their own and just before the half hour mark Bell fed the ball into the path of Rio Brant, his effort from 25 yards going just the wrong side of the post.
The visitors went as close as they had in the 30th minute when a corner kick from the right was flicked on in the middle to an unmarked Cameron Beccles beyond the far post, his flying volley coming back off the woodwork before being cleared by a grateful United defence.
Soon after a melee occured in the middle of the park following what appeared to be a dangerous Hand tackle that left Tom Barrett injured on the ground however the Casuals player only saw yellow for the challenge with United stopper Lewis Lavin receiving the same for a push having rushed from his goal.
The final opening of the half was to fall United's way in the 43rd minute as Sells' free-kick from the right side of the box was only cleared as far as Bell who got a shot away that Rose did well to push away low to his right and we went in at the break scoreless.
United manager Andrea D'Anna made a formation change at the break with Cody Bentley replacing debutant Andrew Akyeampong-Ekumah which saw United switch to a back three.
Once again however it was the visitors who started quickest and with three minutes played Victor Koah and Addo Amankwah combined well on the right with the latter pulling the ball back to Rory Edwards who saw his goalbound effort pushed wide by Lavin.
Just before the hour mark United's Jhamar McDonald, now playing in the wing-back role, burst forwards from the halfway line into the Casuals area but his shot was well blocked by Rose who sttod up well with the Casuals defence clearing up the loose ball before a United player could get to it.
As we moved into the final quarter of the game the visitors started to put more and more pressure in the United defence which by now had to change shape once more following the loss through injury of central defender Taffel McCootie.
Beccles headed a Conor Darwish corner wide of the post and this was quickly followed by an overhead kick from Hand that Lavin did well to tip over at full stretch and United's stopper was in action again a minute later when a free-kick from the left was fired low into the centre of the six yard box, a slight touch sent the ball goalwards only for Lavin to react quickly to push it away.
The visitors must have thought they had broken the deadlock on 76 minutes when the lively Omondi broke through and took the ball around Lavin's dive, his initial shot was superbly defended on the line by Trent Headley and when the ball dropped to Hand his effort too was well blocked on the line by the United defence and the goal remained intact.
With three minutes of the ninety remaining Omondi again broke through, this time he was denied by an excellent Cody Bentley tackle that took the sting off the shot enabling Lavin to gather comfortably.
In stoppage time United could have won it and sadly for the hosts the visitors did win it. As we entered five additional minutes, McDoanld received the ball wide on the right, his centre was met by Sells in the middle but his header was blocked away by Rose and the chance was gone.
Then in the final minute of stoppage time the deadlock was broken, somewhat controversially by the visitors. Joshua Green and Koah exchanged passes on the right and despite a very audible shout of "leave it" from a Casuals player, referee Norton deemed no offence had taken place, and the ball was fired across to the far post giving substitute Sam Ince a tap in to seal Casuals progression to the next round at the expense of a United side that gave its all and only came up marginally short against an established Academy side.
Report by Kevin Watts.
United Man of the Match: Jhamar McDonald.
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