Two goals from Oscar on his Champions League debut have given Chelsea a narrow lead over Juventus after 45 minutes of play at Stamford Bridge.
The hosts twice went close to falling behind inside the opening half hour.
First, Claudio Marchisio beat the offside trap but took a heavy touch and allowed Petr Cech to smother at his feet.
Arturo Vidal slid in Mirko Vucinic moments later, however the Montenegro striker could only find the sidenetting from eight yards.
Juventus were punished for their poor finishing on 31 minutes, as Oscar's 25-yard effort deflected past Gianluigi Buffon into the top corner of the Italians' goal.
If his first strike was a little fortunate, his second - two minutes later - was of the highest quality.
Ashley Cole found the Brazilian on the edge of the penalty area and, following a sublime first touch that spun him away from Andrea Pirlo, he hit a stunning first-time effort, which curled into the top corner.
Vidal reduced the Blues' advantage seven minutes before the break with a low left-footed drive from 20 yards.
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