Arsenal lost further ground on the Premier League pace-setters after they were held to a goalless draw at West Ham.
A frustrating evening at the London Stadium saw the Gunners dominate for long spells but they were unable to break down a stubborn home side.
And they were inches from a damaging defeat after Hammers sub Javier Hernandez hit the crossbar with a minute remaining.
While a third game without a win was another blow to Arsenal's Champions League hopes, a point was another step in the right direction for West Ham following Saturday's win over Chelsea.