Havant conceded 11 tries as Tonbridge Juddians powered to a 67-17 win in National three London & south east at Hooks Lane.
The home side competed well in most phases but found themselves heavily outgunned once Tonbridge breached their front-line defence.
‘In the second half Tonbridge proved too big and too strong,’ said Havant director of rugby Will Knight.
‘They possessed too much firepower but we gave a good account of ourselves.
‘Once we missed our first-up tackles they had the finishers to exploit it.’
The home side made a bright start with James Read scoring an early try.
But while scrum half Jake Reynolds and Joel Knight also crossed for a tries, the visitors led 29-17 at half-time.
Tonbridge went on to dominate the second half, stretching away for an easy win.
London two south west champions Gosport & Fareham ended their campaign on a winning note.
They beat Guildford 20-17 despite playing more than half the game with 14 men.
The visitors saw Simon Pickett red-carded following a 33rd-minute scuffle and also had to overcome the unavailability of up to 11 players through injury and illness.
‘To win here under the circumstances shows just why we are champions,’ said head coach Mark Wells.
‘The character in this team is unbelievable and they showed they are capable of winning games when the chips are down.’
In a strong start, Alex Duncombe put over a penalty and converted a fine Andy Vance try for the visitors.
Guildford hit back with two tries inside six minutes but another Duncombe penalty ensured Gosport & Fareham led 13-12 at the break.
Gosport fell behind to a try early in the second half but dug deep to snatch the win through a David Cleary try converted by Duncombe.
United Services ended their home league campaign in Hampshire one with a 28-14 win over Petersfield at Burnaby Road.
There was further misery for basement side Southsea Nomads, who suffered a 103-5 hammering at Ventnor.
Fareham Heathens secured a third-place finish in Hampshire two after edging to a 17-16 win over Overton at Cams Alders.