I really need this phrase in English well explained/translated in Spanish please!

"I'm at least going to give him a run for his money"

Context: Two competitors, one of them has less chance to win than the other and said that but money is not in the context =(

Question

I really need this phrase in English well explained/translated in Spanish please!

"I'm at least going to give him a run for his money"

Context: Two competitors, one of them has less chance to win than the other and said that but money is not in the context =(

Answer

Este dicho originalmente se usaba para describir las carreras de caballos y sus apuestos. Quiere decir que no voy a evitar compitiendo a pesar de tener poca oportunidad de ganar. Si compita lo máximo posible, al menos la carrera no va a estar fácil para mi rival.