Arsenal suffered a huge blow in their title aspirations as they lost 1-0 away to Stoke City.
The only goal of the game was a Jonathan Walters penalty, awarded after Laurent Koscielny was adjudged to have handled the ball in the area.
The Gunners had the majority of the ball, but they failed to capitalise on that and managed only two shots on target in the entire match.
It could have all been very different if Yaya Sanogo had converted a gilt-edged chance at the end of the match, but the substitute missed from close range with time running out.
The result means Arsenal are now four points behind leaders Chelsea with just 10 matches to go. They are also just two points ahead of Manchester City, who now have two games in hand over Arsene Wenger's men.
Stoke's win means they are now level on points with Hull City and just one point outside the top 10.