With two goals for Real Madrid vs Eibar on Saturday, Ronaldo has averaged 1.7 goals per match over his last 10 appearances.
Ronaldo put Madrid ahead in the 34th minute after Luka Modric intercepted a ball from defender Aritz Arbilla and placed a ideal pass for the Portugal forward to control with his chest and fire in.
The visitors unsuccessfully sought the equalizer before the break, but all they got were several corners.More news: Riyad Mahrez keen on forcing move to Roma?
Bale struck his eighth Liga goal of the season by opening the scoring in Real's 3-1 win over Getafe on Saturday, though his half-hearted celebration was also seen as a sign of his discontent at being dropped from the starting 11.
Ronaldo's bullet header from Dani Carvajal's cross in the 84th minute earned Madrid the three points.
Los Blancos continued to struggle as Eibar pressed and the home side were inches from taking the lead four minutes later when a teasing cross from Takashi Inui almost found Kike at the near post, but he could not convert.
The win has now temporarily closed the gap between Real and their fierce rivals Atletico Madrid to four points as Zidane's side look to stay in touching distance of the top two.
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"The first thing we need to do is forget about this disappointment and focus on Tuesday's game", Montella said.