English Championship side Nottingham Forest have beaten League One club Preston North End 2-0 in their FA Cup replay at Deepdale.
Forest now travel to face Sheffield United in the last 16, with a place in the quarter-finals up for grabs.
United are another League One side who, unlike fourth-placed Preston, are struggling in the third division - the Blades are second bottom and fighting relegation.
But they knocked out Premier Leaguers Fulham with a shock 1-0 win away in the last minute of extra time in London in their replay on Wednesday.