Luke Price helped guide the Ospreys to a second successive win
The Ospreys Under 18 made it two wins from two with 16-10 victory away to Cardiff Blues on Wednesday night.
Following on from an opening win over last year's champions the Scarlets, it represents a perfect start for Shaun Connor's side.
"I'm disappointed with the performance but pleased with the win," said the Ospreys head coach.
"We have to be pleased with two victories from two away games but we know there is a lot to work on in the next week before we play the Dragons. We will be working on our accuracy and we'll be looking at our basic skills of catch, pass and tackle technique. They are the key things and core skills the boys will have to work on in order to become professional players in the future."
On the positives to be taken from the win, Connor added: "The result was good but it was a disappointing game overall. It turned into a war of attrition but luckily enough we came out on top".
Ospreys fly half Luke Price, said: "I think it went well, we dogged it out to the end. We had to defend a lot and I thought the boys stuck in very well.
"Obviously there are areas we know we have to work on in training and then we have to go out there and do the same again."
On home surface, the Blues had started well with an early penalty from James Whittingham putting them into a 3-0 lead.
However, no sooner had they moved into the lead than the Blues received a major setback. Wing Ellis Wyn Benham was given a red card for a tip-tackle on Price, the fly half getting up to level the scores from the resulting penalty.
A man down, the Blues were now up against it and a pair of further penalties from Price put the Ospreys into a 9-3 lead.
The numbers were then temporarily levelled up when Matthew Dodd was yellow carded for the Ospreys, the Blues taking advantage with a try from Owen Young - Whittingham adding the conversion to put his side into the lead for the first time.
Their advantage didn't last long though as straight from the restart, Ospreys and Wales U18 forward Jon Fox scored right under the posts. Price then converted with the Ospreys going into half time leading 16-10.
The second half continued in much the same way but when the Blues were penalised for holding on after 58 minutes, the Ospreys took what turned out to be the only opportunity of the second half for either side to have a kick at goal.
Unfortunately, Price put the long range kick wide before the Ospreys again found themselves down to 14 men, Rees Geely shown a yellow card this time around.
The last play of the game saw the Blues have a line out just feet from the try line but despite some constant pressure, the Ospreys held on to secure the win.
In the other game to take place, the Dragons and the Scarlets shared a 16-16 draw at Pandy Park. The match turned into a shootout between the two fly halves, Arwel Robson kicking three penalties for the Dragons with Dan Jones doing likewise for the Scarlets.
Jones also added a try which he himself converted but a try for the Dragons from wing Lloyd Lewis and the extra two from replacement Connor Goode meant the sides could not be separated.
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.