Cesc goal opens up six-point lead
Sunderland 0 Chelsea 1
Cesc Fabregas' first Premier League goal of the season handed Chelsea victory at Sunderland and sent them six points clear at the top of the table.
Fabregas, making just his third league start of the season, struck in stylish fashion five minutes before the break to secure a second 1-0 win inside four days and their 10th success on the trot, although it took a superb stoppage-time save by Thibaut Courtois to deny Patrick van Aanholt a last-gasp equaliser.
Antonio Conte's men dominated for long periods in front of a crowd of 41,008 at the Stadium of Light, but could not kill off their hosts, who remain rooted at the bottom of the pile despite a spirited display.
Perhaps unsurprisingly, the leaders struggled to break their hosts down despite enjoying a wealth of possession with Fabregas orchestrating from deep, and the opening 39 minutes passed largely without incident as the Black Cats soaked up pressure with little real difficulty.
However, the game exploded into life as the whistle approached with defender David Luiz forcing goalkeeper Jason Pickford into his first save with a deflected long-range free-kick, although the respite proved to be fleeting.
Seconds later Fabregas exchanged passes with Willian before curling a right-foot shot wide of Pickford's despairing dive to give the visitors a 40th-minute lead which they might have doubled in stoppage-time.
O'Shea upended Diego Costa, who had endured a frustrating evening until that point, on the edge of the penalty area and Willian curled the resulting free-kick inches wide with the travelling fans behind the goal convinced it had gone in as the ball rustled the side-netting.
Chelsea looked to have eased their way to the points in the second half, but Courtois had to be at his best to claw Van Aanholt's 93rd-minute piledriver to safety.