Chelsea missed the opportunity to go eight points clear at the top of the Premier League when they were held to a 1-1 draw against Southampton at Stamford Bridge in a game in which the officials' decisions will again be scrutinised.
Jose Mourinho's men were looking to respond to their Champions League exit against PSG in midweek by tightening their grip on the title after Manchester City's loss at Burnley, and went in front through Diego Costa's first league goal in almost two months.
Dusan Tadic equalised after a contentious penalty, awarded for a foul by Nemanja Matic on the impressive Sadio Mane. Replays showed Matic slid in from behind and made contact with the ball, but referee Mike Dean pointed to the spot and booked the midfielder.
Chelsea might have had a spot kick of their own for a Tadic foul on Branislav Ivanovic -- but then Dean gave the Blues the benefit of the doubt rather than reduce them to 10 men for all but the opening minute of the second half.
Matic could have marked his domestic return following a two-match ban for his dismissal against Burnley with another sending off, but avoided a second booking for a foul on Mane within seconds of the restart.
The Blues, who are six points clear at the top, still have a game in hand on City and remain firmly in control of their own destiny as they bid for a first Premier League title in five years.
Manchester United moved to within just two points of second-placed Manchester City thanks to a commanding 3-0 victory against Tottenham.
United needed only nine minutes to break the deadlock at Old Trafford as Marouane Fellaini found the bottom corner after being played in by Michael Carrick.
Carrick turned from provider to goalscorer, doubling his side's lead with a well-taken header after Tottenham had failed to deal with a corner.
And Wayne Rooney made it three inside 34 minutes, capitalising on poor Spurs defending to race clear of two opponents and then slot past Hugo Lloris.
His celebration -- pretending to box before falling to the ground -- made reference to footage that was unearthed showing him appearing to be knocked unconscious by friend and Stoke City full-back Phil Bardsley.
Tottenham failed to recover from their first-half display and were unable to pull a goal back after the break as United held on comfortably for the win.
Everton claimed a first Premier League win since January as they saw off 10-man Newcastle 3-0 at Goodison Park.
Not since a 1-0 victory at Crystal Palace on Jan. 31 had Everton last recorded a league triumph, but goals from James McCarthy, Romelu Lukaku and Ross Barkley ensured Roberto Martinez's side had something to smile about.
McCarthy opened the scoring on 20 minutes with a strike from outside the box before Lukaku doubled the lead from the penalty spot after Aaron Lennon was brought down in the box.
Lennon was soon fouled again, this time by Fabricio Coloccini -- who received a straight red -- with Barkley compounding Newcastle's misery with a strike late on.