A moment of madness from England hooker Tom Youngs handed Saracens victory but the second-placed Londoners were frustrated by their failure to earn a four-try bonus. With Leicester 6-0 up after 37 minutes, Youngs was sin-binned for a barge on Chris Ashton, who had passed the ball to Richard Wigglesworth and as he tried to return the favour Tigers Matt Smith grabbed it. Ashton was nowhere near getting the ball, which made Youngs' action even more senseless. Saracens scored two tries with him off and the game was as good over at 14-6 when he came back. Saracens winger Chris Wyles crashes over a try despite the attention of Freddie Burns (left) and Tom Youngs . Sarries No 8 Billy Vunipola makes a trademark bullocking run into the heart of the Tigers defence . Tigers director of rugby Richard Cockerill said: 'If you block a bloke you are going to get penalised and probably go to the bin. 'It is cynical and it was a moment of madness but he does a lot of good things for us. I was disappointed with our discipline because you can't do that. It gets you in trouble and it did today.' Billy Vunipola scored after Youngs' exit and Marcelo Bosch scored after the break. After Youngs came back, Chris Wyles went over for a third after some shocking defence and with more than half-an-hour left Saracens should have earned a bonus point. Saracens and England lock George Kruis makes a bust through the Leicester midfield . Tigers full back Mathew Tait tries to offload following a crunching hit from Saracens substitute Scott Spurling . With Vunipola in rampaging form Christmas and Ashton lively again they were odds-on to do it but they spent the time defending, marshalled by Brad Barritt, and failed to score a fourth try yet again – which could come back to haunt them in the end-of-season play-offs. Director of rugby Mark McCall said: 'There is frustration in the dressing room because we scored our third try after 48 minutes and not much happened after that. 'We have scored three tries in nine different Premiership games and those bonus points could be crucial in terms of home semi-finals.' Saracens fly half Charlie Hodgson attempts a conversion from the sideline at Allianz Park .
Saracens scored through Billy Vunipola, Marcelo Bosch and Chris Wyles.
Charlie Hodgson added seven points from the boot.
Leicester replied with two Freddie Burns penalties.