VANCOUVER, BRITISH COLOMBIA – Crawley who provided the FA Cup shock of the day as the League Two side defeated Championship Hull 1-0 thanks to Matt Tubbs' 57th-minute goal to reach the fifth round for the second successive year.
League One Sheffield Wednesday looked to have followed up their third-round win over West Ham by knocking out another Championship side as Clinton Morrison lobbed them ahead at Blackpool but Kevin Phillips equalised in injury time via a dubious penalty.
League Two Swindon were the heroes of the third round after knocking out top-flight Wigan but they went down 2-0 to Leicester as Jermaine Beckford made it five goals in the competition this season.
Birmingham were comfortable 4-0 winners against Sheffield United at Bramall Lane thanks to goals from 17-year-old Nathan Redmond, Wade Elliott and a brace from Adam Rooney.
Rickie Lambert's 31st-minute goal looked like it would be enough for Championship high-fliers Southampton to beat Millwall but Darius Henderson struck four minutes from time to secure a 1-1 draw.
In the all-League One clash, Damion Stewart's own goal (12) put Stevenage into the fifth round for the first time in their history as they beat Notts County 1-0.