Jermain Defoe scored two penalties as third-bottom Sunderland prevented Liverpool from significantly trimming Chelsea’s lead at the Premier League summit in a 2-2 draw on Monday.
Liverpool twice went ahead, through Daniel Sturridge and Sadio Mane, but Defoe’s two spot-kicks mean Chelsea will move eight points clear if they win at Tottenham Hotspur on Wednesday.
Substitute Enner Valencia, Leighton Baines and Romelu Lukaku scored in the last 17 minutes as seventh-place Everton overcame Southampton 3-0 at Goodison Park.
Champions Leicester City have now gone 12 league games without an away win following a drab 0-0 draw at Middlesbrough that left them six points above the relegation zone in 14th place.
West Bromwich Albion remain a point below Everton in eighth after coming from behind to win 3-1 at home to second-bottom Hull City.
Robert Snodgrass volleyed Hull ahead, but despite losing Jonny Evans to injury, West Brom stormed back to win through goals from Chris Brunt, Gareth McAuley and James Morrison.