- Wayne Rooney becomes United's joint-record goalscorer.
- Anthony Martial doubles the lead after 15 minutes.
- Marcus Rashford scores twice late in the second half.
- Holders Manchester United safely into the fourth round.
Well that brings an end to our coverage from the game at Old Trafford. We'll be back late with live coverage of Preston North End vs Arsenal from 4pm. But until then, goodbye.
Full time: Manchester United 4-0 Reading
Reading's misery is over and Manchester United collect an eighth straight win and cruise into the fourth round. The headlines belong to Wayne Rooney, who goes level with Sir Bobby Charlton on 249 United goals. Anthony Martial doubled the lead before Marcus Rashford's late brace secured the win. Jaap Stam's side rarely threatened throughout the 90 minutes but they can return to their promotion challenge.
Liam Kelly's free-kick gives Reading a chance to get a consolation but his effort is headed behind by Obita. Not been at the races from the first minute, have the away side. But of course, promotion is the priority this season. They trail second place Newcastle but six points with a game in hand in the Championship.
A look at that horrible Al Habsi error.
Rashford extends the United lead with an easy finish.
GOAL! Manchester United 4-0 Reading (Marcus Rashford)
The wheels have come off Reading now. Al-Habsi miss-kicks as he ball rolls into his own six-yard box and Rashford has the simple task of smashing into an empty net. Perfect afternoon for United.
GOAL! Manchester United 3-0 Reading (Marcus Rashford)
Cool finish from the England striker as United put the tie firmly to bed. Michael Carrick plays a 30-yard pass to Rashford, who races past Gunter and passes beyond Al-Habsi. Caps what has been a polished United display.
Danny Williams takes aim from 25 yards after a long passing move, but it goes well wide. Sergio Romero has not been tested once this afternoon, as we enter the final 20 minutes.
Bit of pressure from Reading as Kermogant is denied by Smalling's block before Jones gets his foot in to deny McCleary an effort from point blank range. Good spell from the visitors.
It has been a matter and when, rather than if with regard to a third United goal and Reading somehow survive again. Rooney and Rashford link up to deadly effect, but Ver der Berg gets a toe on the ball to deny the latter making it three.
Rooney should have the United goal record. Al-Habsi gets down to deny Fellaini and the loose ball falls to Rooney, who is denied by the leg of the Reading 'keeper.
Ashley Young is a very lucky boy. He dives in on Jordan Obita and leaves a foot in, but is shown only a yellow card. Bit of a let off for the full-back.
Low shot from Michael Carrick, who is back on after being patched up, beaten away from Al-Habsi. Reading looking a bit more solid but United still creating chances.
Break in play after a clash between Kelly and Carrick, which has left the United midfielder needing treated for a gash on his head. Both players look ok to continue. Let's hope the respective medical teams have assessed them properly.
Liam Kelly has impressed in attempting to get Reading back into the game.
Can Rooney create history today? One chances comes and goes for him as, on the stretch, he diverts Young's cross over the top.
Jordan Obita on and Tyler Blackett off for Reading at the start of the second half. No changes for United.
Half time: Manchester United 2-0 Reading
Jose Mourinho is heading for an eighth win in a row and into the fourth round of the FA Cup, after United eased into a comfortable lead over an overwhelmed Reading. Wayne Rooney is the man of the hour after equaling Sir Bobby Charlton's goalscoring record, before Anthony Martial made it two. Jaap Stam's return to Old Trafford has turned somewhat sour.
Chances aplenty for United first as Evans blocks Mata's effort and then Young's cross just evades Rooney. Now Mata skews over. Reading have improved as the half has progressed, but they've allowed United continual efforts on goal.
Anthony Martial puts United into a position of comfort with the second goal.
Al-Habsi wining the duel with Rashford, who is denied again after being played through by Rooney. The Reading stopper did well to stay on his feet and the Royals remain in the tie.
Rooney aiming to go clear of Charlton this afternoon and he tries a little chip which sails over Al-Habsi's goal.