Zinedine Zidane's side ran out 6-0 winners, and if Bale can contribute in similar fashion to the final league game of the season against Villarreal, the Frenchman might have to deal with a selection headache heading into the Champions League showcase in Kiev.
Bale burst onto Luka Modric's pass to smash home a low opener and scored a fantastic second, cutting in from the right, nutmegging Jonny Castro and shooting from a hard angle.
"It's better to have everyone plugged in", Zidane said at his post-match press conference.
Bale celebrated by dedicating his performance to his third son Axel Charles who was born on Tuesday.More news: Bank of England holds United Kingdom interest rates at 0.5%
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Gareth Bale may yet have a big role to play in the Champions League final.
Isco made it three two minutes later. Today was the last game at the Bernabéu and we did all we could to play well and win it.
The capital club got off to a quick start in the local derby, as Koke collected Antoine Griezmann's pass and drove a low shot into the bottom corner to score his fourth goal of the campaign in the eighth minute. He is playing very well, not just his goals, that he is going well in everything.
Managerless Sevilla have to beat Alaves next weekend to secure a spot in Europe's second-tier competition.