Home favourite Jon Rahm will take a five-shot lead into the final round of the Mutuactivos Open de Espana after a remarkable back nine of 28 on day three in Madrid.

The defending champion was two shots off the lead at the turn after back-to-back bogeys in the Spanish capital but carded five birdies and a hole-out eagle on his way back to the clubhouse to sign for a 63 and sit at 17 under.

Countrymen Rafa Cabrera Bello and Samuel Del Val were his closest challengers at Club de Campo but they have a mountain to climb if they are to deny the world number five a third worldwide win of the season and a place at the top of the Race to Dubai standings.

"I've never teed up with such a lead," Rahm told europeantour.com. "Every time I've teed off it's been a one-shot lead or tied for the lead so it's going to be a little bit of a different story.

"I don't know what the challenge is going to be. I have a real good chance to defend this title, I'm feeling good so hopefully I can keep doing what I've been doing.

"It's just one of those days where everything was going good for me on that back nine."

After turning in 35, some fantastic approach play coupled with an up-and-down from the sand at the par-five 14th saw Rahm birdie five of his first six holes on the back nine, before holing out from the fairway for an eagle on the par-four 16th.

World number 1,413 Del Val is currently without playing rights on any major tour and he chipped in on the 16th before birdieing the last in a 69, while 2016 Ryder Cup star Cabrera Bello carded a 70.

Swede Jens Dentorp was at 11 under, with England's Steven Brown, Scot Calum Hill and Welshman Jamie Donaldson all 10 shots off the lead.