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Arsenal overtook opponents West Ham and moved into fourth place in the Premier League by winning an eventful match at Emirates Stadium.
Gabriel Martinelli scored the opener early in the second half before substitute Emile Smith Rowe confirmed victory for the Gunners late on.
Arsenal captain Alexandre Lacazette also had a penalty saved by goalkeeper Lukasz Fabianski in the second half.
West Ham's Vladimir Coufal was sent off for a second booking in conceding the penalty as he was judged to have fouled Lacazette in the box.
Coufal had been booked in the first half when his flailing arm caught defender Kieran Tierney in the face, inciting protest from the Arsenal players.
Tierney later hit the crossbar, while there were further chances for Martinelli, Bukayo Saka and Gabriel as Arsenal were the better side throughout.
Arsenal gather momentum in Champions League chase
The significance of this result on the league standings was felt in an intense and feisty encounter.
Coufal's unintentional foul on Tierney in the first half incited protest from Arsenal's players, before referee Anthony Taylor quickly defused the situation with a yellow card.
A few heavy tackles followed before Taylor had to speak with Arsenal's coaching staff near the touchline.
The hosts began to dominate on the field though - as well as Tierney's strike clipping the crossbar, West Ham centre-back Craig Dawson was forced to make numerous blocks.
Saka was Arsenal's biggest threat down the right and he was involved in the build-up to Tierney's effort, before he teed up Lacazette's shot which was parried into the path of Martinelli and poked inches wide.
In the second half, Saka himself came close too, while West Ham's best chances fell to Pablo Fornals and Jarrod Bowen - neither really troubling goalkeeper Aaron Ramsdale.
The sending off of Coufal - which West Ham understandably felt was unjust - did not make too much difference and despite a late surge from the visitors, Arsenal were able to see it off through Smith Rowe's late goal.
Arteta named an unchanged side following Arsenal's win over Southampton and his celebrations at full-time suggested he was happy once again with this performance, where a number of young players impressed.
Despite a strong start to the season, West Ham have won just one of their last six games in the Premier League and are now just three points clear of Tottenham in seventh.
Player of the match
TierneyKieran Tierney
with an average of 7.83
Arsenal
Squad number3Player nameTierney
Squad number7Player nameSaka
Squad number10Player nameSmith Rowe
Squad number35Player nameGabriel Martinelli
Squad number32Player nameRamsdale
Squad number9Player nameLacazette
Squad number18Player nameTomiyasu
Squad number6Player nameGabriel Magalhães
Squad number8Player nameØdegaard
Squad number4Player nameWhite
Squad number5Player namePartey
Squad number20Player nameNuno Tavares
Squad number30Player nameNketiah
Squad number34Player nameXhaka
West Ham United
Squad number1Player nameFabianski
Squad number41Player nameRice
Squad number15Player nameDawson
Squad number20Player nameBowen
Squad number50Player nameAshby
Squad number23Player nameDiop
Squad number28Player nameSoucek
Squad number8Player nameFornals
Squad number9Player nameAntonio
Squad number10Player nameLanzini
Squad number5Player nameCoufal
Squad number26Player nameMasuaku
Squad number22Player nameBenrahma
Line-ups
Arsenal
Formation 4-4-1-1
- 32RamsdaleBooked at 72mins
- 18Tomiyasu
- 4White
- 6Gabriel
- 3Tierney
- 7Saka
- 5Partey
- 34Xhaka
- 35MartinelliBooked at 58minsSubstituted forNketiahat 82'minutes
- 8ØdegaardSubstituted forSmith Roweat 66'minutes
- 9LacazetteSubstituted forTavaresat 88'minutes
Substitutes
- 10Smith Rowe
- 15Maitland-Niles
- 16Holding
- 19Pépé
- 20Tavares
- 23Sambi Lokonga
- 25Elneny
- 30Nketiah
- 33Okonkwo
West Ham
Formation 4-2-3-1
- 1Fabianski
- 5CoufalBooked at 67mins
- 15Dawson
- 23Diop
- 26Masuaku
- 28Soucek
- 41Rice
- 20Bowen
- 8FornalsSubstituted forAshbyat 84'minutes
- 10LanziniSubstituted forBenrahmaat 76'minutes
- 9Antonio
Substitutes
- 7Yarmolenko
- 11Vlasic
- 13Areola
- 16Noble
- 22Benrahma
- 33Král
- 40Oko-Flex
- 42Alese
- 50Ashby
Referee:Anthony Taylor
Attendance:59,777
Live Text
Match ends, Arsenal 2, West Ham United 0.
Second Half ends, Arsenal 2, West Ham United 0.
Attempt missed. Granit Xhaka (Arsenal) left footed shot from outside the box is too high. Assisted by Emile Smith Rowe.
Attempt blocked. Saïd Benrahma (West Ham United) right footed shot from outside the box is blocked.
Foul by Thomas Partey (Arsenal).
Tomas Soucek (West Ham United) wins a free kick in the attacking half.
Substitution, Arsenal. Nuno Tavares replaces Alexandre Lacazette.
Goal! Arsenal 2, West Ham United 0. Emile Smith Rowe (Arsenal) left footed shot from outside the box to the bottom right corner. Assisted by Bukayo Saka following a fast break.
Substitution, West Ham United. Harrison Ashby replaces Pablo Fornals.
Foul by Thomas Partey (Arsenal).
Saïd Benrahma (West Ham United) wins a free kick on the left wing.
Substitution, Arsenal. Eddie Nketiah replaces Gabriel Martinelli because of an injury.
Gabriel Martinelli (Arsenal) wins a free kick on the left wing.
Foul by Michail Antonio (West Ham United).
Attempt saved. Emile Smith Rowe (Arsenal) right footed shot from outside the box is saved in the bottom right corner. Assisted by Bukayo Saka.
Attempt blocked. Bukayo Saka (Arsenal) left footed shot from the centre of the box is blocked. Assisted by Gabriel Martinelli.
Corner, Arsenal. Conceded by Issa Diop.
Substitution, West Ham United. Saïd Benrahma replaces Manuel Lanzini.
Attempt missed. Gabriel Magalhães (Arsenal) left footed shot from the centre of the box is close, but misses to the right following a corner.
Corner, Arsenal. Conceded by Michail Antonio.
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