Pontypridd recorded a magnificent victory at Vicarage Road as they became the first Welsh side to reach the semi-finals of the PARKER PEN SHIELD.
A try in each half for the Welshmen put paid to the English premiership side and made them only the sixth team in 24 quarter-finals to win away from home.
While there was plenty of attacking intent from the visitors in the first half, they had to rely on the woodwork at the death to deny the Saracens as former Springbok outside-half Jannie De Beer struck an upright with a 45-metre penalty that would have won the game.
More than that, Ponty then had to suffer a scrum under their own posts after a knock-on when the ball rebounded back from the penalty.
Saracens went for the drop goal, but Ponty somehow managed to force De Beer, the man who once drop-kicked England out of the Rugby World Cup finals in Paris with five drop goals, onto his left foot.
De Beer's kick drifted wide and the game ended as soon as the ball went dead.
Ponty were good value for their victory as they scored a try in each half to make it a notable day for Welsh rugby with Llanelli also beating Bath in the Heineken Cup.
No 8 Michael Owen was credited with the first try a minute before half-time that gave the visitors a 10-6 interval lead once Brett Davey had added the conversion.
De Beer struck three successive penalties in the first 10 minutes of the second half to hoist Saracens into a 15-10 lead, but Gareth Wyatt skipped away for the vital score five minutes later and Davey once again added a conversion.
After that, it was all about brave and organised defence and Ponty came up trumps - with a little bit of help from the upright.
SCORERS: Saracens: Pens: J de Beer 5. Pontypridd: Tries: M Owen, G Wyatt; Cons: B Davey 2; Pen: B Davey .
Saracens: T Horan; G Arasa, T Shanklin, K Sorrell (A Winnan 47), D O'Mahoney; J de Beer, K Bracken (captain, N Walshe 55); D Flatman (M Cairns 70), R Russell, P Du Randt, S Hooper (K Roche 47), S Murray, K Chesney, T Roques, R Hill.
Pontypridd: B Davey; G Wyatt, S Parker, J Bryant, N Simpason; C Sweeney, P John (captain); G Jenkins, M Davies, D Bell, B Cockbain (G Remnant 50), R Sidoli, N Kelly (D McIntosh 46), R Parks, M Owen.
The Welsh Rugby Union is forming a new Youth Board with a brief to help keep more young people involved in the game during their late teenage years and beyond. The first task of the fifteen strong Board will be to analyse and consider the issues which lead to a number of youngsters drifting away from the sport between the ages of 16 and 21. To apply visit www.wru.wales/youthboard
The Foster's Challenge Cup will involve the 12 Principality Premiership sides and will run during European and British & Irish Cup weeks, providing vital fixtures for the participating clubs and an opportunity for upcoming players to step up to semi-professional rugby and make a claim for starting places within the Premiership squads.
Eighty schools and colleges in Wales now have a full time rugby officer as part of the WRU's school club hub scheme. All of the school club hub officers recently gathered at the National Centre of Excellence for various workshops.
With Liam Williams forced out of the World Cup through injury, lock Luke Charteris and Skills Coach Neil Jenkins say they have to put yesterday's defeat behind them as Wales now look ahead to another physical encounter against South Africa in the quarter-finals of the Rugby World Cup.
WRU Consultant Head of Physical Performance Paul Stridgeon praises the Physical Performance department for their work and dedication as he addresses the media ahead of Wales' Pool A clash against Australia
Twelve young people have been selected to follow a one year WRU Coach Core apprenticeship programme. Coach Core was set up by the Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry as part of the Olympics legacy in 2012 and the Duke of Cambridge was on hand to meet the apprentices on their first day in the job. The programme has been funded by the Hunter Foundation.
The WRU has launched a campaign to create a long term legacy for Welsh club rugby by highlighting the advantages of volunteering. Rhian Edwards, a volunteer at Seven Sisters, has enjoyed many benefits of her volunteering at a grassroots rugby club including being part of the Rugby World Cup volunteer workforce after being nominated by the WRU - and the WRU is asking for more people to develop their 'Welsh rugby roots'.