Have you seen a marble race

So intense!

First i guessed the that blue one, but in the middle part I lost hope, but in the last turn he overtook red again! I'm so happy! I'm gonna watch again, but now I'm gonna bet on red, so excited!

GODdAmMIT YELLOWreD MArBLE!

But aren't the marbles the same weight so they both go the same speed just the how the track is build affects the marbles which one wins