Full-time: West Ham 1-5 Arsenal
- Arsenal move up to second place in the Premier League after easing past West Ham at the Olympic Stadium courtesy of a fine Alexis Sanchez hat-trick
- The Chilean played a big hand in the opening goal, squaring the ball for Mesut Ozil to tap home after Francis Coquelin had blocked Angelo Ogbonna's poor pass
- Sanchez opened his personal account 18 minutes from time after turning Arthur Masuaku and finding the opposite corner from an acute angle
- He doubled his tally with a smart finish from the edge of the penalty area before Hammers substitute Andy Carroll, making his first appearance since August following knee trouble, reduced the deficit and headed home his first of the season after Dimitri Payet's free-kick cannoned back off the crossbar
- Alex Oxlade-Chamberlain restored Arsenal's three-goal advantage soon after with a curling strike from 25 yards and Sanchez completed the rout with an impudent chip over Darren Randolph that came after he should have been flagged for offside
- The Gunners, who could drop to third tomorrow depending on Liverpool's result at Bournemouth, have now gone 13 top-flight matches unbeaten and have not lost a league game away from home since February
- West Ham's injury worries continue to mount with James Collins forced off after only six minutes
- An eighth league defeat of the season already drops Slaven Bilic's side to 17th, one point above the relegation zone
That is your lot for today, but join my IBTimes UK colleague Tony Mogan for a Sunday Premier League double-header. In addition to that aforementioned clash between Bournemouth and Liverpool, Everton entertain Manchester United at Goodison Park.
Life does not immediately get any easier for West Ham, meanwhile. After facing Tottenham, Manchester United (twice) and Arsenal in successive matches, next on the agenda is a tricky trip to Anfield next Sunday.
The injuries are piling up for the struggling Hammers, who have lost as many Premier League games (eight) already this term as they did throughout the entire 2015-16 campaign.
Still not acclimatising to their soulless new home, they now drop to 17th. Sunderland's third win in four matches against Leicester earlier this afternoon means the gap to the bottom three has closed to just one point.
Worrying times indeed.
So Arsenal move up to second and three points behind Chelsea after that Sanchez-inspired late romp. The Gunners, who will drop one spot if Liverpool beat Bournemouth tomorrow, have now gone 13 league matches unbeaten. They have not lost a single top-flight away match since February.
Next up for Arsene Wenger's men is a Champions League trip to St Jakob-Park in Basel on Tuesday evening. They need an unlikely favour from Bulgarian champions Ludogorets if they are to pip Paris Saint-Germain to top spot in Group A and avoid a tough last-16 draw.
West Ham 1-5 Arsenal
Still Arsenal come forward in search of more goals but Randolph spares further embarrassment by denying Oxlade-Chamberlain and rushing out at the feet of Ramsey.
The three minutes of stoppage time are almost up.
It is absolutely raining late goals in E20 as Sanchez completes a delectable hat-trick. The former Barcelona forward looks marginally offside as he is played in by Oxlade-Chamberlain, but the flag stays down.
Sanchez then races through ahead of Reid and commits Randolph with a cheeky stepover before beating the goalkeeper with an impudent chip.
A fantastic individual display.
Goal: West Ham 1-5 Arsenal (Alexis Sanchez)
Oxlade-Chamberlain restores that three-goal cushion with a sumptuous long-range strike that nestles neatly in the bottom corner.
Goal: West Ham 1-4 Arsenal (Alex Oxlade-Chamberlain)
A consolation goal for West Ham as Carroll reacts quickest to head past Cech after Payet's free-kick clangs off the crossbar.
That's the injury-stricken striker's first of the season.
Goal: West Ham 1-3 Arsenal (Andy Carroll)
Sanchez wraps up the three points for Arsenal. The ball loops up off Reid and he shows the composure necessary to trick Ogbonna and create space to pick out the bottom corner from 20 yards.
Goal: West Ham 0-3 Arsenal (Alexis Sanchez)
Ayew is attempting to add something of a late spark for West Ham. He shows good feet in the penalty area but sends his shot straight into the legs of Koscielny.
A powerful shot on the turn from Ayew fails to test Cech and Sanchez's latest drive is deflected behind.
That second Arsenal goal has rather killed any enthusiasm for Carroll's arrival. The returning striker replaces Mark Noble.
What a fine individual effort from Sanchez, who executes a wonderful turn and accelerates past Masuaku after being picked out by Mustafi.
He then shifts the ball wide of Ogbonna before firing across Randolph and into the opposite corner from a tricky angle.
Goal: West Ham 0-2 Arsenal (Alexis Sanchez)
A super double save from Randolph denies Ramsey and Ozil after Oxlade-Chamberlain feeds Monreal on the overlap. Terrific goalkeeping.
Wenger's first change of the evening sees Walcott make way for Aaron Ramsey.
Arsenal slice through West Ham with an incisive counter-attack. Walcott looks to round it off with a goal-bound shot that is well blocked by Ogbonna.
Referee Craig Pawson calls play back to book Reid, no doubt frustrated with that attractive sequence of first-touch passing, for unceremoniously upending Sanchez.
Cech makes a comfortable stop from Fletcher's header and Payet runs out of room after a lovely piece of skill.
Ayew comes on on place of Fernandes. The countdown to Carroll continues...
Carroll is returning to the bench after another warm-up down the touchline, but it looks like Ayew will be sent on first.
Arsenal temporarily go down to 10 men after Gabriel is left bleeding following a clash of heads with Masuaku.
Fletcher is booked for standing on Koscielny's foot.