The Red Devils moved to the top of the Premier League for the first time since May 2013 after a 3-0 victory over Sunderland at Old Trafford on Saturday afternoon.
Netherlands international Memphis Depay broke the deadlock before captain Wayne Rooney and Mata sealed three points for the home side in the second half.
Ominously for Arsenal, Mata has scored in back-to-back games for the 20-time English champions this term, taking his tally to three for the Premier League season.
And the World Cup winner is already relishing next Sunday’s clash against Arsenal.
Mata wrote on his blog One Hour Behind: “At the end of the week we will visit Arsenal. It’s a big game, no doubt, and we will fight to defend the top place before the international break.
“Personally, I like playing at the Emirates, and I’m sure it’s going to be a good game… I hope United win!”
Mata scored in his last two appearances at Emirates Stadium as a Chelsea player.
However, the 26-year-old is yet at Arsenal’s ground since he moved to United in a £37.1m deal from Chelsea in January 2014.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news