Manchester City boss Roberto Mancini was delighted with his players after victory over Stoke City.
Aguero was named man of the match for another outstanding contribution, taking his seasonal goal tally to 15.
However, there were plenty of other contenders too.
"But as I have said many times, it is important to stay there for the rest of the season.
"For this, it is difficult. United continue to win every game, the other teams continue to win; Arsenal, Tottenham.
"But it is better to stay on the top than second.""Sergio scored two goals but all the players did very well," said Mancini. "I am happy to be at the top at Christmas. I am happy for our supporters. They can have a good Christmas Day.