Elvira, who is seeking his first European Tour win, said: I’m quite happy. I played solid all day. I missed a couple of shots but I made some really good saves, especially on the front nine.
It was really nice to finish with a birdie. I hit a really nice second shot and holed the putt, so it feels really good.
It’s been a while since I’ve been in this position but I’ve been working hard and I feel like I’m ready for it. Hopefully, I can keep playing like this over the weekend.
The pair are two shots clear of South Africa’s Brandon Stone, who also carded a 63, with England’s Sam Horsfield a shot further back after a 64.
Former Masters champion Charl Schwartzel is in a group on nine under after a 66, with Scotland’s David Law a shot behind following a 67.
The cut fell at four under par, with 75 players set to contest the final two rounds.