Portsmouth 2-0 Watford
Two second-half goals ensured Portsmouth swept aside 10-man Watford and climbed above the Hornets into 17th place in the Championship table.
Marko Futacs nodded in David Norris's corner before Watford goalkeeper Scott Loach saved from Dave Kitson.
But Loach went from hero to villain when he was sent off for dragging down Futacs outside the box.
Portsmouth pressed forward and sealed victory when Hayden Mullins converted Erik Huseklepp's 87th-minute cross.
Portsmouth's win was well-deserved and their first in four matches.
They dominated the first half but Norris and Huseklepp both failed to find the target from distance early on.
At the other end, Marvin Sordell's deflected effort just before the break was as close as Watford came in the opening period.
The home fans had to wait just nine minutes into the second half, though, before Pompey converted their dominance into a lead, as Norris and Liam Lawrence's short-corner routine picked out Hungarian Futacs.
Lawrence had a goal disallowed and Norris brought a superb save out of Loach before the goalkeeper hauled down Futacs and was duly dismissed.
Watford boss Sean Dyche brought on Jonathan Bond, but the substitute goalkeeper could do nothing about Mullins' powerful finish after blocking his initial shot.
Portsmouth manager Michael Appleton:
"This is definitely our best win yet. It feels fantastic.
"We have created enough chances to win three games. The two (goals) flattered them.
"I said to the players before the game I took the defeat down at their place really personally. It knocked me a little bit."
Watford manager Sean Dyche:
"We were slightly off it. We have set the bar quite high. First half I thought we did OK and made some 'nearly' moments.
"Second half it was a tough one for us. There was a lot going against us and we found it tough to keep going.
"No lack of effort or organisation, just players not on their game."