Havant failed to recover from a nightmare start as they endured a comprehensive 38-17 London south one defeat at Sidcup.
The Kent side rattled up 19 points in the opening 10 minutes and there was no way back for the visitors after that.
A much-improved second-half performance offered some consolation but Havant were well beaten.
‘It was a highly-frustrating day at the office from my point of view,’ said head coach Will Knight.
‘We made a disastrous start, conceding three tries in quick succession. The first one set the scene for a terrible opening.
‘Their kick-off was falling short but our prop forward tried to play it and only succeeded in knocking it straight to them and they ran through and scored.
‘So instead of restarting with a scrum on the halfway line, we found ourselves standing under our own posts waiting for their conversion.
‘We literally didn’t get started.’
It went from bad to worse because at the very first line-out Havant had a player yellow carded for taking an opposition jumper out while still in the air.
After conceding two further tries, Havant finally managed to steady the ship – only to lose concentration again in the final five minutes of the half.
During that spell Sidcup added two more tries leaving Havant with a mountain to climb at the break.
Another try at the start of the second half compounded Havant’s misery before they finally woke up to hit back with three tries of their own.
‘Effectively the game was over before we roused ourselves,’ said Knight.
‘We scored three good tries but it was far too little, too late.
‘In the first half we were never able to create a platform to get us onto the front foot.
‘When our forwards finally showed up we were able capitalise on it.’
Joel Knight got Havant on the board with a well-taken try, which he converted himself.
Josh Blackburn and Nick Goodger also went over for tries.
‘Hopefully we will put a few things right against Staines next week,’ said Will Knight.