League one side Leyton Orient are hoping to cause one of the biggest shocks in the FA Cup's illustrious history when they host defending Premier League champions Manchester City on Saturday.
You can watch the tie live on BBC One and also listen to Chris Sutton's co-commentary from Gaughan Group Stadium on BBC Radio 5 Live - but is our predictions expert expecting an upset?
"City boss Pep Guardiola always takes the FA Cup seriously," Sutton said. "He will have to this season, because it is the best chance they have got of winning a trophy.