Premier League Middlesbrough were held to a 0-0 draw at Championship (second division) side Sheffield United in the FA Cup fifth round on Sunday.
United dominated a tight match in which their former England striker James Beattie hit the post with a free kick in first half stoppage time, the closest either side got to a goal.
Portsmouth were away to Preston North End in the later kickoff in their bid to reach Monday's quarter-final draw.
Holders Chelsea and last year's finalists Manchester United both went through on Saturday along with League One (third division) Bristol Rovers and Championship sides Cardiff City and West Bromwich Albion. Liverpool were upset 2-1 at home by Barnsley of the Championship.
