Qatar's five-times winner Nasser Al-Attiyah was in second place for the Dacia Sandriders team, 40 seconds behind de Mevius.
Al-Attiyah retains overall lead; Sixth-placed Sebastien Loeb, the nine-times world rally champion driving for Dacia, remained in contention and was within 17 minutes of his leading teammate.
The 410km stage from Wadi Ad Dawasir to the overnight bivouac, first half of a marathon stage, was won by 21-year-old Polish non-factory Toyota driver Eryk Goczal.
'I love both sport -- rally and shooting. And this was my dream for a long time, to be champion in rally and champion in shooting and this was really a good thing what I make for myself' 'When I started rally, I was looking for another sport to help me from (the) concentration side and I find myself one day practicing shooting and I said, 'okay this is a right sport to help me for driving, for rally'