The striker curled a beautiful shot into the top corner just before half-time, with his goal capitalising on a change in momentum after Barca defender Pau Cubarsi was sent off for a tackle on Giuliano Simeone.
After the match, he said: "Yesterday we practiced free-kicks. I took several, maybe five or six, and did not score any. Today was the day. It came at a key moment, so I’m very happy."