The game between Manchester United and Chelsea ended in a thrilling draw as Robin van Persie's 94th minute equaliser helped Louis van Gaal's side gain a point after Didier Drogba gave the visitors the lead.
After an entertaining encounter at Old Trafford, which finished with the score level at 1-1, the Red Devils proved they might be able to have a say on the title race this season.
Here's an assessment of five things we learned from the Premier League clash.
1.Chelsea can do the 'Invincibles'
So far this season, Chelsea have shown every sign of emulating Arsenal's legendary 'invincibles' by going a full season unbeaten. The Blues have already beaten Arsenal, defeated Everton away from home and emerged undefeated from the Etihad and now Old Trafford.
It was a spirited performance from Jose Mourinho's side who were missing their top scorer Diego Costa through an injury. The Stamford Bridge side travel to Liverpool in a few days and if they manage a victory or a point at Anfield, there shouldn't be any dubiety in our minds as to why they cannot go a full season unbeaten.
- Robin van Persie explains decision after topless celebration
- Manchester United have room for improvement after Chelsea draw
- Louis van Gaal caught Manchester United players watching El Clasico
2. United showed their best performance of the season
Chelsea went into the game as clear favourites. But United's resilience and support from the home fans managed to bring out the best in the Red Devils which was perspicuously missing in the last few weeks.
Louis Van Gaal's side matched Chelsea toe to toe in the game and some could argue that they were the better side of the two, however marginally.
Van Persie's injury time equaliser brought the feel good factor back to Old Trafford and this might act as the watershed in United's league season.
3.Marcos Rojo still looks unconvincing as a centre back for United
The defensive pairing of Chris Smalling and Marcos Rojo was the 8th partnership that Louis Van Gaal has tried in 9 Premier League games this season.
With Phil Jones and Jonny Evans injured, the Argentinian international has been the only mainstay at the back. Rojo did good to stop Chelsea scoring another goal but the former Sporting Lisbon man looked reckless and lacked that positional and mental sense in large portions of the game.
From rugby tackling John Terry to giving the ball away from inside the box, Rojo was clearly uncomfortable facing the likes of Drogba, Oscar and Willian.
A strong defensive pairing has always been United's bedrock for success under Sir Alex Ferguson. Garry Pallister and Steve Bruce, Jaap Stam and Ronny Johnsen, Nemanja Vidic and Rio Ferdinand, United have always had a strong defensive united and it could be a long time before Van Gaal establishes another formidable defence at the back.
4.United are significantly weaker without Rooney
Juan Mata had three games to prove Louis Van Gaal that he is as good a No.10 as Wayne Rooney but the crafty Spaniard did little to convince the Dutchman. Mata lacked the urgency and work rate that Rooney brings into the game.
It would be really surprisingly if the United captain doesn't go straight into the starting XI against Manchester City next week in place of Mata after serving a 3-game-suspension.
5.John Terry is still right up there with the Premier League's best defenders
Chelsea's captain, leader, legend produced a truly remarkable performance in the game. Terry won the areal battles against Van Persie and did a fantastic job keeping the Dutchman from scoring early on in the game.
A constant threat inside the opposition box during corners, the Blues legend gave Marcos Rojo and Chris Smalling a tough time throughout the match.
At 33, the former England captain showed United what it is like to have a defender of such quality after the Old Trafford side lost both Nemanja Vidic and Rio Ferdinand at the end of last season.