Arsenal ended a run of four league games without victory as they won 2-0 at Bournemouth on Sunday to go joint-second in the Premier League.
Mesut Ozil and Alex Oxlade-Chamberlain scored the goals midway through the first half to move Arsenal above Manchester City, level on points with Tottenham Hotspur. They trail leaders Leicester City by five points with 13 games to play.
Manchester United remain fifth, six points off a Champions League place, after a 1-1 draw at champions Chelsea in the day's other match.
Ozil put Arsenal in front after 23 minutes with an athletic, right-foot volley after a good header back by Olivier Giroud.
One minute later, Oxlade-Chamberlain rifled a low shot across the goal which went in off the post.
"We beat a good side, it was three difficult points but three very important points for us because we had not won for a while," Arsenal manager Arsene Wenger said.
"We had a strong start, with good finishing and we controlled the game.
"We lost a bit of our urgency in the second half. We lost the killer instinct to get the third goal and on top of that Bournemouth are physically a strong team."
Bournemouth enjoyed plenty of possession and Arsenal goalkeeper Petr Cech had to be alert to prevent the hosts from getting back into the match.
Bournemouth remain 15th, just five points above the bottom three, with manager Eddie Howe left to rue a slow start.
"We were much-improved in the second half without getting that goal to put them under pressure," he said.
"We kept going, kept fighting, and if we had got that goal back with say 20 minutes to go, it would have made for an interesting finish.
"We got into some really good positions without the cutting edge we have had in recent weeks."
United must have thought they had won at Stamford Bridge when they led 1-0 going into injury time thanks to a brilliant second-half goal by Jesse Lingard.
Lingard's tight swivel and unstoppable shot was worthy of winning any game but Chelsea equalized in time added on through Diego Costa.
Spain forward Costa then almost won it for the home side with a fine strike from close range, but David De Gea blocked the shot.
Thibaut Courtois also had a good game in the Chelsea goal as the points were shared.
Chelsea remain in the bottom half, in 13th place.