Chelsea failed to win for only the third time in the Premier League season as Sunderland held Jose Mourinho's men to a 0-0 draw at the Stadium of Light.
The draw sees the Stamford Bridge outfit six points clear at the top of the table ahead of current champions Manchester City.
As The Black Cats stifled Jose Mourinho's free-scoring Chelsea side - holding the Blues to their first score-less match of the season - Oscar made surprisingly little in the way of an impact. It proved a quiet performance from the Brazilian, before he was eventually replaced with 15 minutes left to play
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The 23-year-old played five key passes in total - second to only Cesc Fabregas - but his attempts to dictate proceedings in the final third proved futile.
With Gus Poyet's Sunderland side happy to sit back and soak up the Chelsea pressure, he struggled to make the kind of impact he has in recent weeks.
Oscar found himself bullied by Sunderland's Lee Cattermole in the centre of the park - the English midfielder was exceptional, making five tackles and three interceptions, while further contributing with three clearances - and as he dropped deeper in order to influence the game, he found himself becoming even less effective.
Jose Mourinho holds a soft spot for the youngster, largely due to his impressive work-ethic.
Nonetheless, he offered little throughout this lethargic performance. In a defensive capacity he proved just as ineffective. He made just two clearances, failing to win a single tackle or interception.
As Chelsea missed an ideal opportunity to extend their lead at the summit of the Premier League table, Oscar largely failed to impress.