The Blues got the better of Hull City 2-0 at Stamford Bridge with Eden Hazard opening the scoring in the seventh minute with just his second league goal with his head when nodding home a cross from Oscar.
It took a little over 60 minutes for Jose Mourinho's side to notch their second but it came in the form of a milestone goal through Diego Costa who scored for the 12th time in England's top flight since his summer move from Atletico Madrid.
In Leicester, Manuel Pellegrini's Man City side edged Leicester City 1-0 at King Power Stadium in a match which produced yet another landmark, seeing Frank Lampard become the Premier League's equal-fourth goalscorer.
The veteran midfielder, who is on loan from MLS expansion side New York City FC, tapped home Samir Nasri's pass in the 40th minute to join Arsenal great Thierry Henry on 175 league goals which has him sitting behind Alan Shearer (260), Andy Cole (187) and Wayne Rooney (178) on the all-time scoring charts.
There were some concerns for reigning champions City, however, with captain Vincent Kompany forced off late with a recurrence of his recent hamstring problem while Edin Dzeko was injured in the warm-up and had to be replaced by youngster Jose Angel Pozo before the first whistle.
Nevertheless, it was a seventh-straight victory in all competitions for City who have been able to maintain pressure on Chelsea while Nigel Pearson's Foxes remain rooted to the foot of the table on the back of a four-match losing streak.
Olivier Giroud continued his successful return to injury with a brace while Santi Cazorla also chimed in with two goals, including a late penalty, after Ayoze Perez had netted his fourth league goal for the Magpies since arriving from Tenerife in the summer.
The triumph kept under-fire manager Arsene Wenger's Gunners in touch with the top four as they are now just two points behind West Ham who occupy the fourth position.
At Turf Moor, Ashley Barnes managed to knock home a blocked clearance in the 73rd minute to give Burnley a 1-0 home win over Southampton after Tom Heaton had brilliantly kept out a penalty from Dusan Tadic.
The victory was the third of the season for the Clarets and helped lift them out of the relegation zone and condemned the Saints to a fourth consecutive defeat.
At the Stadium of Light, Jordi Gomez gave Sunderland the lead in the 22nd minute when sending West Ham United goalkeeper Adrian the wrong way from the penalty spot after James Tomkins had felled Adam Johnson but Stewart Downing levelled seven minutes later to force a 1-1 draw.
In the West Midlands derby, Craig Gardner opened his account for West Bromwich Albion when firing home a rebound from inside the area in the 72nd minute to give the Baggies a 1-0 win over local rivals Aston Villa who had Kieran Richardson sent off for a poor challenge on Stephane Sessegnon after 21 minutes.
Sunday sees arch enemies Manchester United and Liverpool do battle at Old Trafford while Tottenham take on Swansea City at the Liberty Stadium prior to the Monday night clash between Everton and QPR at Goodison Park.
2014/15 Barclays Premier League - season scores
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