West Brom have won none of their past nine away matches against West Ham (D6 L3), all in the Premier League between 2005 and 2018.
West Ham haven’t lost a home FA Cup match against a team from outside the Premier League since January 1997, a 1-0 defeat by Wrexham; they are unbeaten in 12 since (W10 D2), winning the last eight in a row.
West Brom manager Slaven Bilic hasn’t managed a game against West Ham since leaving the club in November 2017 – his only previous FA Cup match at London Stadium was as Hammers boss in January 2017, a 5-0 defeat by Manchester City.
West Ham manager David Moyes is looking to reach the FA Cup fifth round for the first time since leaving Everton at the end of 2012-13, failing with Man Utd in 2013-14, Sunderland in 2016-17 and the Hammers during 2017-18.