With West Ham first-choice goalkeeper Lukasz Fabianski set for a lengthy absence because of a fractured cheekbone and eye socket, stand-in keeper Alphonse Areola will be keen to impress.
And he's made a super start today. In only the sixth minute he got down superbly to his right to deny Marcel Sabitzer what would've been his first goal for the club.
Then, six minutes later, Areola was again in top form to keep out Alejandro Garnacho's well-struck effort from the edge of the penalty area.
West Ham last won an FA Cup tie here in January 2001 when Paolo Di Canio took advantage of some attempted mind games from Fabian Barthez, who was appealing for an offside, when Di Canio slotted the ball past him.