A tight match was lit up six minutes after the interval when Mateo Retegui saw Raya plunge down to his right to keep out his penalty, after a foul by Thomas Partey on Ederson.
The ball rebounded up in the air and Retegui looked set to casually nod the dropping ball into the gaping net but the Spaniard sprang to his feet and hurled himself back across the goal-line to claw the ball to safety.
"It's just a penalty and I was lucky to go the right way and save it," Raya told TNT Sports.
"I was unlucky to give the rebound straight back to him but I was quick enough to get up and save it."
The second matchday of the Champions League league phase will take place on October 1 and 2 with Arsenal hosting Paris Saint-Germain, Bayern Munich travelling to Aston Villa and reigning champions Real Madrid visiting Lille.
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