THIS is the shocking moment a brawl erupted between Manchester United fans at Old Trafford.<br /><br />The scrap broke out as the Red Devils crashed to a 2-1 opening day defeat against Brighton.<br /><br />A video posted on social media showed two men grappling in the South Stand as the game carried on in the background.<br /><br />Stunned onlookers attempted to get involved by trying to break up the unsightly melee.<br /><br />The short clip ended with the two men squaring up to each while shouting in front of dozens of supporters.<br /><br />It is unclear what triggered the fight between the pair.<br /><br />But neither will have been happy with the end result at the Theatre of Dreams.<br /><br />Erik ten Hag was hoping to mark his first-ever Premier League game with a morale-boosting win.<br /><br />But the day turned into a nightmare for United as two goals from Pascal Gross put Brighton on course for a historic win at Old Trafford.<br /><br />Red Devils fans have only just got over the 4-0 stuffing at the Amex late last season.<br /><br />And United were miles off the pace as their flops failed to deliver the goods yet again.<br /><br />Some irate fans staged a protest against the Glazer ownership before the game.<br /><br />And United’s farcical transfer window has gone from bad to worse after it emerged they are trying to sign 33-year-old Marko Arnautovic from Italian minnows Bologna.<br /><br />Meanwhile, Ten Hag has told warring fans not to expect a quick fix on the pitch.<br /><br />He said: “It is a hell of a job. We have to work really hard, analyze then move forward.<br /><br />“We have to take the lessons and learn quickly from it. We don’t have time and we have to deliver.
