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.
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Wales U20 face a tough group in the Junior World Championship with France, England and Japan lying in wait but Attack coach Jason Strange and back rower Tom Phillips are looking forward to the campaign ahead.
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Wales winger Luke Morgan has established himself as one of the deadliest finishers on the Sevens World Series. WRU TV's Graeme Gillespie catches up with him on the eve of this weekend's round in Glasgow.
All roads lead to Cardiff on Sunday for the SSE SWALEC Finals Day at the Millennium Stadium. Cambrian Welfare tackle Ystradgynlais in the Bowl final, Ystrad Rhondda play Newcastle Emlyn in the Plate final while defending champions Pontypridd face Bridgend in the Cup final.
WRU Chief Executive Roger Lewis, Deputy Minister for Culture, Sport and Tourism Ken Skates and WRU Chairman Gareth Davies earlier this week launched a new competition in conjunction with the WRU unveiling its archive room.
Welsh players and management joined Deputy Minister for Sport Ken Skates at the Pierhead Building, Cardiff Bay earlier this week to reveal the Union's pioneering school-club hub initiative has been so successful the project will now almost double the scale of the original project.
The Scarlets, Newport Gwent Dragons, Cardiff Blues and the Ospreys look ahead to Judgement Day III which sees the Blues take on the Ospreys (2.30) and the Dragons tackle the Scarlets (4.45pm) at the Millennium Stadium tomorrow afternoon.
Ystradgynlais and Ynysddu played out a titanic struggle at Taffs Well in the SSE SWALEC Bowl semi-final. At the end of the game neither team could be separated after a 15-15 stalemate but Ystradgynlais go through on try count.