The away side had the best of the chances in the first period, but neither could make the breakthrough with the scores level at the interval.
Rayo secured all the points 10 minutes from time, however, when Alex Galvez whipped a free kick into the top corner.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
ALMERIA: Esteban; Nelson, Pellerano, Trujillo, Garcia; Corona, Soriano, Verza, Vidal; Suso, Rodri
RAYO VALLECANO: Ruben; Arbilla, Tito, Galvez, Adrian; Trashorras, Saul, Castillo, Falque; Viera, Lass
Almeria make their second change of the match as Azeez enters in place of Corona, who has struggled to influence proceedings this evening. Rayo are down the other end with Viera moments later, but he loses possession at the final moment. Still we are no closer to the opening goal of the match with little over 25 minutes remaining.