Newcastle win 5-4 on penalties
Newcastle keeper Steve Harper eased the pressure on under-fire boss Glenn Roeder with a crucial save in the penalty shoot-out win at Watford.
Emre (right) celebrates Newcastle's early goal with goalscorer Sibierski
Harper saved from Jordan Stewart after a thrilling 2-2 extra-time draw.
Antoine Sibierski headed Newcastle ahead from Emre's free-kick but Watford drew level when Damien Francis slid the ball in from Ashley Young's free-kick.
Danny Shittu's extra-time header put the Hornets 2-1 up but Scott Parker's calm finish forced penalties.
Roeder's side were desperate for a lift following the dismal display in the Premiership home defeat against Sheffield United at the weekend.
And the fit-again Sibierski provided that boost within four minutes, meeting Emre's fine free-kick to head the ball home past Richard Lee to put the visitors 1-0 up.
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That set the tone for a thrilling game that saw both sides create a host of chances.
Darius Henderson twice went close for Watford and Steven Taylor nearly doubled the visitors' lead but his header went just wide.
Roeder's side were booed off against Sheffield United last week
The lively Damien Duff also forced a fine save from Lee but Newcastle could not find the crucial second goal.
A spell of home pressure saw Matthew Spring blaze a shot over and Tamas Priskin also sent a flicked effort narrowly wide.
Newcastle started to threaten on the counter-attack but were unable to withstand the home pressure and Watford equalised when Francis slid in to divert Young's teasing free-kick past Harper just past the hour.
Duff almost snatched victory in the final 10 minutes but his low drive crashed back off the far post.
And Watford looked set for the quarter-finals when Danny Shittu powered a header past Harper early in the first period of extra-time.
Inspirational Magpies skipper Parker had other ideas and he raced on to Nolberto Solano's pass to calmly finish past Lee and force penalties.
Harper was the hero in the shoot-out, saving from Stewart and securing Newcastle's place in the quarter-final draw.
Watford manager Adrian Boothroyd:
"We didn't particularly play well. We showed lots of spirit but were nowhere near as good as we can be.
"We kept giving the ball back to them and you can't do that.
"But we got back in it and we should have won it. When you are 2-1 up with five minutes to go you expect it to be closed down, but it wasn't to be."
Newcastle manager Glenn Roeder
"I didn't feel like a condemned man at 2-1 down, not at all. It never crossed my mind, the final whistle had not gone.
"There were four minutes left and we were on the up and what Scotty Parker did he was capable of doing.
"Yes, we ran it close to the wire, but in the end we got what we deserved by going on to win the game on penalties."
Watford: Lee, Doyley, DeMerit, Shittu, Stewart, Young, Francis, Spring, Bouazza, Henderson, Priskin (Bangura 73).
Subs Not Used: Chamberlain, Mackay, Powell, McNamee.
Goals: Francis 69, Shittu 108.
Newcastle: Harper, Carr, Ramage, Taylor, Babayaro, Milner, Emre, Parker, Duff, Sibierski (N'Zogbia 114), Rossi (Solano 100).
Subs Not Used: Srnicek, Luque, Huntington.
Booked: Babayaro, Sibierski.
Goals: Sibierski 3, Parker 116. Newcastle win 5-4 on penalties
Ref: L Mason (Lancashire).