Eurosport - Oscar, second left, celebrates after scoring Chelsea's second goal of the game against Brentford
Juan Mata fired a clinical opening goal after 54 minutes and Oscar, who hit the outside of a post in the first half, tucked in his second goal in four days after 68 minutes.
Mata was the provider for Lampard's 199th Chelsea goal before Terry headed in an 81st-minute fourth as last season's Champions League winners stayed on course for a fifth FA Cup triumph in seven seasons.
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