Milford Haven 5
Milford Haven might have expected a home win against basement battlers Lampeter but the visitors showed the form that enabled them to beat Tenby the previous week in the Swalec Plate competition.
Lampeter used the Observatory Field slope to full advantage in the first half to lead 26-0 as the Mariners rarely looked likely to snatch the verdict.
Prop Zane Lowe opened the Lampeter scoring with a try, followed by a good try by inside centre Gareth Griffiths, both converted by ace kicker Huw Thomas.
Then Lampeter second row Geraint Thomas added the third, a superb solo try, followed by the fourth try, to secure a bonus point, by winger Josh Bailey, one of them goaled by Huw Thomas.
The Mariners held the edge after the oranges but as conditions worsened it was hard to string together enough flowing moves to recover such a huge lead.
All they could muster was a single unconverted try by centre Ian Rusinek as reward for his overall play.
There was a further blow for the homesters when talented scrum half Aaron Sprowell sustained a nasty leg injury late in the game, and Telegraph Sport wishes him a speedy recovery.