United saw off rivals Liverpool with a 3-2 win in the fourth round. They come into this game having lost just one of their last nine in all competitions (W5 D3), and did beat today's opponents 3-1 in the Premier League earlier this season. As for West Ham, they cruised past Doncaster Rovers with a 4-0 win last time out in the competition and also come into today on a good run, losing just one of their last 11 in all competitions (W7 D3).