National League three London & south-east leaders Canterbury proved far too powerful for Havant, who conceded 13 tries in a crushing 81-15 defeat.
James Sutton grabbed a try in each half for the visitors but Canterbury overpowered them in the second half.
‘We competed well in the first half and did quite well against very, powerfully fit opponents,’ said director of rugby Will Knight.
‘In the second half, though, they were fitter and we couldn’t cope with their superb offloading game.’
Both Havant tries were scored by Sutton.
In the first-half, Sutton intercepted and ran in from half-way and, after the break, capitalised on a searing break from Darren Bamford to cross for a second time.
Portsmouth suffered a 37-20 defeat at Haywards Heath in London south one.
A depleted Southsea Nomads took a first-minute lead at New Milton & District but ended up losing 69-17 in their Hampshire One encounter.
A quick tap penalty allowed centre Sam Till to race over, with Mike Wareing adding the conversion.
Wearing added a penalty but Nomads trailed 19-10 at the break.
All Nomads could manage in the second half was a consolation try by centre Tom Hardy which Wareing again converted.
United Services Portsmouth fell to a 27-19 defeat at Millbrook and Petersfield’s disappointing campaign continued with a 53-0 defeat at Fordingbridge.
Fareham Heathens slipped to a 32-15 home defeat at the hands of Southampton.