Eriksen netted the eventual game-winning goal and assisted another in Spurs' 2-1 victory, proving to be a menace for much of the contest and streamlining the squad's attack at an impressive pace.
The Dane first made his impact on a brilliant cross in the 34th minute, which found Emmanuel Adebayor in the middle and he put it in to put Spurs up heading into halftime at Old Trafford.
Per Tottenham Journal's Ben Pearce, he hit a perfect cross despite being on an unfamiliar side:
#thfc Great movement from Eriksen to set up Adebayor's opening goal. He's meant to be on the left but delivers killer cross from the right.— Ben Pearce (@BenPearceSpurs) January 1, 2014
But it was his big-time finish at the end of a Tottenham attack in the 68th minute that put Tottenham up for good. He was on the other end of an Aaron Lennon effort, as a cross came through to the middle of the box and bounced before Eriksen drooped down to head it into the net.
Premier League captured a stunning photo of the fateful play:
United would answer one minute later with a goal, but it didn't make any difference as Eriksen's efforts were the difference in a huge three points for Tottenham.
Eriksen was one of the leaders of a Tottenham offense that seemed as dangerous as it has looked in some time.
The passing was on point and efficient from Eriksen and company. Despite only holding 39 percent possession, Spurs made the most of their chances by generating plenty of scoring opportunities and finishing two of them.
He's also showing some budding chemistry with strikers Adebayor and Roberto Soldado. Whether it's setting them up with space or finding them with crosses, things are starting to click in the Tottenham attack and it has a lot to do with Eriksen.
Eriksen's success at Tottenham didn't start immediately after signing over the summer. In fact, he didn't notch his first Premier League goal until Dec. 26 and only has two goals in 11 appearances, both of which have come in the last week.
But if that week has been any indication, Eriksen is only beginning to fulfill his potential with Tottenham.