Jose Mourinho says Paul Lambert "wants to be the ref."
Hazard and Oscar combined to force the early breakthrough as the latter's perfectly weighted through-ball sent his colleague clear inside the penalty box.
The Belgian's curled effort was palmed away by the stretching Brad Guzan, but he could only force the ball into the chest of the helpless Luna from point-blank range.
Despite the early setback, Villa did not resemble the flaky team that conceded 69 top-flight goals last team, remaining compact as they fought to prevent a repeat of Chelsea's rampant first-half display against Hull.
Chelsea 2-1 Aston Villa: Paul Lambert on moments 'unpunished'
Indeed, they could have levelled the game only for Andreas Weimann to make poor contact with Luna's centre after he had intelligently peeled away from marker Ashley Cole.
Chelsea continued to dominate possession without ever threatening, and this lack of penetration was to be punished seconds before the half-time whistle.
Christian Benteke has scored an unrivalled 17 Premier League goals in 2013
Gabriel Agbonlahor burned off the sluggish Ivanovic out wide, with Benteke in position to expertly place an equaliser off Petr Cech's near post after he was given a yard of space by Chelsea captain Terry.
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