Jackson Arley Martínez Valencia (born 3 October 1986), known as Jackson Martínez, is a Colombian professional footballer who plays as a striker for Spanish club Atlético Madrid and the Colombia national team. He is often named Cha Cha Cha for his dance-like moves on the pitch. Noted columnist Tim Vickery describes him as "an out-and-out goalscorer, a front-to-goal centre-forward who can finish off both feet". He was Primeira Liga's top scorer in all three of his seasons at Porto.