What caused Manchester United fans to throw tennis balls onto the pitch during the match?

Manchester United fans threw tennis balls onto the pitch at Old Trafford in protest against the club's owners, the Glazer family, amid poor performance and high ticket prices. The team trailed 0-2 against Roma but completed a comeback to win 2-3.

Manchester United fans threw tennis balls onto the pitch at Old Trafford during a Champions League match against Roma, as part of an unusual protest against the club's owners, the Glazer family. The protest occurred in the 21st minute, with the team trailing 0-2, as fans expressed dissatisfaction with poor performance, rising ticket prices, and the overall management of the club. Before the match, green and gold balloons, associated with the anti-Glazer protest, were released. Despite the deficit, United completed a comeback and won 2-3. Images of the protest went viral on social media.