It was a dominant first 45 minutes from Real, who went in at the break with a five-goal lead.
Ronaldo's first came with 23 minutes on the clock, the striker made a darting run inside Sevilla left-back Lionel Carole and was found by a perfect pass by Marco Asensio.
Through on goal, Ronaldo made no mistake, slotting low past Sergio Rico to open his account for the day.
His second came via a much easier route, from the penalty spot after Jesus Navas was penalised for handling the ball.
Ronaldo took responsibility and just about managed to squeeze an effort below Rico and into the corner to double his tally.
Check out the goals for yourself below:
Real Madrid’s second goal & Ronaldo’s first. Beautiful assist and clean finish. pic.twitter.com/poTvyxKJy8
— MP (@elsaetarubia) 9 December 2017
Check out this awesome video: Ronaldo Goal Real Madrid 3 - 0 Sevilla 09.12.2017 https://t.co/6X5YPQvHW3
— goal highlights (@goalhighlights2) 9 December 2017