The former Los Blancos striker started the season in poor form, scoring just two goals until the start of December, but was confident of turning his poor performances around. Meanwhile, Messi raced ahead, scoring 11 goals in his first eight fixtures, including hat-tricks against Espanyol and Eibar.
However, according to Marca, Ronaldo was confident he would finish with more goals than Messi and made a bet with his Madrid team-mates that he would swoop the Pichichi trophy that season.
The Portuguese star eventually found his scoring boots, and closed in on Messi by the time March rolled around. But the former Barca man pulled away and ended up finishing the season on 34 goals - eight better than Ronaldo.
Messi scored 45 goals across competitions, while Ronaldo finished with 44, after scoring a staggering 15 goals in the Champions League. That was also the season Ronaldo left Madrid at the end of the season to join Juventus in a £99m deal.