Havant turned in a disciplined performance to win 2-0 at Cardiff & UWIC in National League conference west on Sunday.
Strikes from Bruno Gorrini and Charlie Stubbings put the visitors in complete control by half-time.
And Havant kept their noses in front after the break to net a second triumph of the season – and rise to seventh spot.
A trip to Cardiff & UWIC looked daunting on paper, with the Welsh outfit sitting pretty at the top of the table.
But in contrast to recent weeks, Havant took the initiative from the start and never looked back.
After just seven minutes Gorrini put them in front.
An attack down the right fed Gorrini on the penalty spot – and he pushed the ball into the bottom corner of the goal to make it 1-0.
Andy Pett had a couple of opportunities to increase Havant’s lead – the best coming after a penalty corner broke down.
The initial shot was deflected by the Cardiff keeper to Pett.
He made space to shoot but the ball whistled the wrong side of the post.
At the other end, Cardiff worked hard to find a way back into the match but Andy Isaacs was in fine fettle between the sticks for the Havant College-based outfit.
Stubbings cranked up the pressure on them when he tapped home at the far post to make it 2-0.
But while Cardiff enjoyed a decent share of possession, Havant stood strong before the break.
In the second half, Cardiff put their visitors under pressure right from the off.
Once again shooting chances were limited.
A couple of yellow cards threatened to undermine the fine work.
Pett was shown a yellow for a poor tackle and, when he returned, a rash challenge saw Mike Della-Merricks head to the bin.
But despite the home side’s best efforts, Havant stood firm.
Even the loss of centre-back – and skipper – Raj Laly to a cut to the face could not derail their bid for glory.
Gerald Cox and Craig Duffy, who was later named man-of-the-match, were superb in midfield.
Meanwhile, Hollie Smith grabbed a brace as Havant’s ladies were held 2-2 by Maidenhead in South Clubs’ Women’s League division one.
The striker twice put her team in front, only for the home side to be pegged back on each occasion by their Berkshire visitors.
Smith fired the hosts ahead on nine minutes. Katie Pugh broke forward, dribbled the ball into the D before teeing up Holly Firkins to cross for Smith to tuck in.
Skipper Kim Tyrell continued her fantastic form at the back but was powerless to stop Maidenhead levelling early in the second half.
Havant hit back almost immediately, though.
Pugh was the creator again – combining neatly with the impressive Sam Lister before picking out Smith to fire home.
Maidenhead hit back to draw six minutes from time, though, despite a superb show from player-of-the-match Mel Insall between the posts.
The ladies’ second string remain unbeaten in Hampshire League division one after goals from Chris Allberry and Tory Hackman defeated Haslemere 2-1.
Sophie Briggs, who produced a stunning solo run for the winner, was named player of the match.