Arsenal managed to grab their first Premier League win since February, thanks to second-half goals from Ozil, Walcott and Giroud.
The News Agency of Nigeria (NAN) reports that Arsenal boosted their Champions League hopes with a deserved victory over West Ham, who are in relegation trouble after a fifth consecutive Premier League defeat.
Mesut Ozil opened the scoring with a curler after 58 minutes.
Arsenal's win closed the gap on Manchester City in fourth to four points.
"We can't go a goal behind and think the game is over".
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"In the second half they raised the tempo and scored a goal, and they were the better team".
Ozil's performance came after he had felt unfairly criticised following the Champions League last-16 exit to Bayern Munich, but Walcott was in no doubt he would bounce back.
"I have never questioned the mentality of the team, its just when you go through a hard period the confidence and happiness goes quickly and comes back slowly. Going forward we are good but defensively recently we have not been efficient enough".
But Walcott made it 2-0 in the 68th minute, Ozil supplying the cross from the left after a neat one-two with Sanchez. "We are always praised maybe more than we deserve it when it goes well and punished more than we deserve it when it doesn't go well, but that's the whole world".
But, after his players finally produced a result to ease the pressure on the Frenchman, Walcott insisted he sees signs of a well-timed revival as Arsenal chase a top four finish in the Premier League.
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Having been soundly beaten by Arsenal on Wednesday night, West Ham are just five points off the bottom three.
"They were thinking they were going to be in Europe so they brought in players that would supplement the squad who had played European football". One win will change everything for us.
"After the second goal it's very risky to play against them because when you have the ball they let you create and they take a risk staying up with a few players and when you lose the ball it's a problem for the defenders".
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Such comments, though, alongside Ozil's sudden resurgence do allude to a huge weakness in his game.
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"They probably played good because to keep winning against Spurs until 88th minute either you have to be very lucky or play very good, probably both".