Fernando Torres kept Liverpool's title bid on track with a late winner in a five-goal thriller at West Ham.
The Spain striker headed in a Ryan Babel cross quarter of an hour from the end to claim his second goal of the evening and seal a 3-2 win on Saturday for the Reds, who could ill-afford to lose any more ground on leaders Chelsea having already suffered two defeats this season.
Arsenal started the day in a similar position after back-to-back defeats by both Manchester clubs, but the Gunners enjoyed a much more comfortable time as they strolled to a 4-0 win over Wigan at the Emirates Stadium.
Chelsea entertain Tottenham on Sunday, which also sees champions Manchester United take on unbeaten Manchester City in a keenly-anticipated derby at Old Trafford.
Liverpool were never behind at Upton Park but were pegged back twice by West Ham, with Alessandro Diamanti scoring a controversial penalty to cancel out Torres's solo opener and Carlton Cole nodding home after Dirk Kuyt had stabbed in Steven Gerrard's goalbound header.
Liverpool had no reason to complain about West Ham's penalty, awarded when Jamie Carragher shoved Zavon Hines off the ball, but television replays suggested Diamanti's successful spot-kick should not have stood as a slip resulted in the Italian making a double contact with the ball.