Domínguez scored his goal from the penalty spot, burying a right-footed shot into the lower right section of the net.
Domínguez plied his trade for 90 minutes during the match. He scored in the 83rd minute and took three shots.
With 21 points Los Che trail Real Betis by four for the final Europa League spot, and have compiled a record of six wins, seven losses and three draws on the season.
Los Franjirojos are in nine place, and in striking distance of Real Betis in sixth with a record of seven wins, eight losses and one draws leaving them three behind after 16 games.
Rayo Vallecano had 44.8% of possession during the victory. The Rayistas had eight shots, including two on target.
Lass made his mark on the match for Rayo Vallecano after coming on for Franco Vázquez in the 64th minute, as he took two shots.Valencia enjoyed possession for 55.2% of the loss.
Xotos had eight shots, including two on target.
The two attempts by Jonas were the most of any Valencia player.
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