sport news PLAYER RATINGS: Casemiro shows his class with two fine finishes in comfortable ... trends now
With the visitors holding out well and the score at 0-0 at half time, Casemiro produced a moment of brilliance to break the deadlock before scoring again.
Fred made it 3-0, and Andy Carroll was sent off before Amadou Mbengue netted a late consolation.
Below, Sportsmail's Ian Whittell rates both teams' players after the game.
Manchester United reached the fifth round of the FA Cup with a 3-1 victory over Reading
Erik ten Hag went wit ha strong team and they delivered on a comfortable night at Old Trafford
Man United (4-2-3-1)
David De Gea Along with Rashford, the only survivor from United’s 2016 FA Cup Final win was alert to save from Hoilett and had little else to do 6
Aaron Wan-Bissaka Full-back was lively in attack and often appeared in the Reading penalty area. Little to worry about at the defensive end of the field 6
Victor Lindelof Clattered early by Carroll but shook off the effects and relished the tussle with Reading’s physical strike pair although won’t be happy with the Reading consolation 6
Harry Maguire (left) was handed a rare start and looked more composed that he has done
Harry Maguire Handed a rare start and made a couple of very good long-range passes as United tried to break down Reading’s defence. Looked more composed than off late 7
Tyrell Malacia Poor mistake in first half injury-time almost gifted Reading a shock opener and did not offer too much in attack. His late booking summed up his night 5
Casemiro Rashly gave away an early free-kick in a dangerous spot but that was his only error of a night which featured two stunning goals in the space of four minutes 9
Casemiro (left) was in fine form and netted United's opening two goals with superb finishes
Christian Eriksen Ticked over quietly and impressively with an excellent range of passes - one of which set up the opening goal before he was subbed 7
Antony Remains chronically one-footed and missed with a couple of curling efforts although his link-up play and passing was sharp 7
Bruno Fernandes Busy performance and while his shooting left a lot to be desired, was involved in a lot of good moments, including the assist for Fred’s goal 7
Marcus Rashford Looking to score in a record tenth straight home game, he was a constant threat