Antoine Griezmann scored the winner just a couple of minutes after coming off the bench as Atletico Madrid beat Valencia 1-0 in a feisty LaLiga clash.
Griezmann and Thomas Lemar were brought on midway through the second half by Diego Simeone at the Mestalla and they combined to secure all three points.
Griezmann took a pass from Lemar before opening the scoring with a deflected shot to make it two wins out of three for Atleti.
With new signing Edinson Cavani watching on, Valencia had a goal from Yunus Musah disallowed in the first half following a VAR check as they slumped to back-to-back defeats.
Alvaro Morata came close with an early effort from close range, but Valencia started to look more threatening and it appeared they had taken the lead 25 minutes in.
Musah beat Jan Oblak with a rasping long-range drive, but referee Guillermo Cuadra Fernandez ruled the goal out following a check on the pitchside monitor for a foul by Mouctar Diakhaby on Joao Felix.
Neither side looked particularly threatening in the second half until Lemar and Griezmann made an instant impact off the bench, the midfielder winning possession and setting up France forward, whose left-foot shot from outside the area deflected in off Carlos Soler.
Mamardashvili produced an excellent save to thwart Yannick Carrasco after Matheus Cunha had a goal ruled out for offside and Valencia's impressive keeper prevented Griezmann from claiming a double.
Cunha's effort struck the crossbar via a strong hand from Mamardashvili, but Griezmann's goal proved to be enough.