Havant produced a sensational late fightback to beat Southampton Trojans 23-21 at Hooks Lane.
Will Knight’s side hit form to make a winning start to life back in London one south.
Havant had looked to be heading for defeat, trailing 21-12 with just 10 minutes remaining.
But they showed terrific resolve to raise their game in the final stages.
A Joel Knight penalty and an Alex Bruce try moved Havant to within a point of the visitors.
Then newly-appointed captain Joel Knight kept his nerve three minutes from time.
Havant were awarded a penalty on the right of the Trojans 10-metre line.
And Knight stroked his kick through the posts for the winning points.
‘After last season’s relegation it was important we got off to a winning start,’ said director of rugby Will Knight.
‘We have learned a lot from this game, not only about the team but about how tough this league is going to be.
‘Our performance is very encouraging because I know we have a lot more we can give.
‘When Trojans put us under pressure we went inside our shells a bit – that was a hangover from last season.
‘Once we get a few more good results that should see us grow in confidence. This will give us a big lift.’
The home side established a 12-0 lead, with tries by Pete Austin and Pete Living and a Joel Knight conversion.
Trojans hit back, however, with three penalties and a try to lead at the break.
The visitors increased their lead with a further try but Havant stormed back to win.
Gosport & Fareham went down 32-20 at Hove on their return to London one south.
The visitors trailed 21-3 at half-time but hit back with two converted tries by Gareth Jones and Vetaia Veiteve.
Alex Duncombe scored two penalties, with Josh Whitehead notching a conversion but it was in vain.
– KEVIN RICKETTS