He comprehensively got the better of Joel Ward on the left before providing the cutback from which Mata opened the scoring, and delivered an excellent free-kick - as David Beckham watched on from the stands - that Fellaini headed in for his second goal.
United's lead goalscorer Lukaku looked like he was having an off day.
Jeffrey Schlupp was angry to have a penalty claim down after a challenge from Smalling at the other end, while Young drew a save from Hennessey as United searched for a fourth. Intelligent breakthrough bait from Herrera forwarded Martial through his crossing into the goal mouth. I've been lacking in some games, I've been trying to score my first goal of the season and I did today and I'm very happy. We kept playing, we created chances, we pressed and everyone did their job.
With big money signings such as Paul Pogba and Nemanja Matic claiming numerous plaudits in midfield for a United team who have claimed 19 points from a possible 21 to sit joint-top of the fledgling table, Fellaini has quietly become a key piece of Mourinho's team.
Korea bans all types of unregulated ICOs
That said , it's now unclear how, exactly, the country would attempt to regulate crypto. President Oliver Bussmann said the association was unsurprised by FINMA's announcement.
Trump wall prototype to be built this week
However, CBP confirmed that four of the prototypes will be made from concrete , while the others will use alternative materials. The almost 2,000 mile wall proposed by the Trump Administration is estimated to cost almost $22 billion.
Airport chaos as check-in systems fail across the globe
The spokesman added that it is "not an airport issue" but that check-in software has affected a few airlines' check-in systems. Facing chaos and delays, many passengers took to social media to complain and tweeted pictures of the long lines at airports.
This match saw Palace equal Portsmouth's Premier League record of seven straight losses from the start of 2009/10.
"I always try to give him confidence and show him how useful he is to the team - starting matches, coming off the bench, playing offensively, playing defensively". Score 4-0. Game over.
Many expected the Red Devils to easily take apart the sudden relegation candidates and Fellaini duly obliged, grabbing himself a brace to complete a dominant performance.
It was another fine afternoon for Manchester United at home to Crystal Palace on Saturday.
The Red Devils have set a Premier League record for most games without ever losing to a single opponent.
- Juan Mata, who made his 200th Premier League appearance (the seventh Spanish player to reach this feat), ended a run of 809 minutes without a PL goal.