London: Substitute Diafra Sakho scored late on to help West Ham United beat third tier Bristol City 1-0 in the FA Cup fourth round on Sunday and ensure the Premier League side did not fall foul of another upset.
With time running out Sakho connected with Andy Carroll`s cross and headed in off the underside of the crossbar to secure West Ham`s place in the fifth round.
A day after Chelsea and Manchester City were stunned by Bradford City and Middlesbrough respectively, Bristol City looked determined to cause another upset and striker Matt Smith had a header cleared off the line in a goalless first half.
But West Ham improved in the second period and Sakho`s arrival sparked life into the Hammers as he went close with a half-volley before heading home Carroll`s cross in the 81st minute.
Later on Sunday Aston Villa host Championship leaders Bournemouth, while holders Arsenal travel to Brighton and Hove Albion.