Iago Aspas struck twice for Celta Vigo in their 3-1 win over Real Valladolid.
The striker is a major target for Swansea City boss Michael Laudrup.
Aspas enhanced his burgeoning reputation with a fine run and finish from Michael Krohn-Dehli's through ball after just eight minutes, but Valladolid were back level moments later when Alberto Bueno converted from the spot after Javi Varas had brought down Javi Guerra.
However, Aspas restored the lead with a penalty of his own on the half hour mark and Lopez sealed the points seven minutes into the second-half with a brilliant strike from 25 yards that rocketed into the top corner.