I must say you that the language used in sports chronicles is not the most academic and recommended. Usually they used many repeated phrases that are well understood by sports fans.
"Suma en definitiva", means that in conclusion, or at the end, the Atlético adds points.
"cae a los puestos de descenso", means that, by the moment, the Deportivo is one of the three worst teams, so if it continues this way, it will be relegated to the second league next year.
I totally agree with Leandroadolfo, the sport languaje is not the best to try to learn english, as usually it is not gramatically correct and they invent some words to give more emotion.