The England fly-half was imperious with the boot in the face a partisan French crowd, with a perfect 11 kicks from as many attempts in a staggering 32-point haul.
Chris Wyles scored Saracens' only try of a tense clash, though the Aviva Premiership side had to cope with two yellow cards and a worrying injury to David Strettle to pull off a vital victory.
The result leaves Saracens one win away from reaching the quarter-finals for the second year in succession.
Luc Ducalcon and Juan Imhoff (two) were the try-scorers for Metro, with Sebastien Descons kicking the rest of their points.
- Sports & Recreation
- Aviva Premiership
- Chris Wyles
- David Strettle