World number 909 Kristian Krogh Johannessen outshone a host of home favourites to claim a shock lead after day one of the Mutuactivos Open de Espana.
Johannessen, who has missed the cut 13 times in 17 events in his rookie season on the European Tour, carded an eagle and seven birdies in an opening eight-under-par 63 at Club de Campo to lead by two shots from Adri Arnaus.
Defending champion Jon Rahm and Rafa Cabrera Bello, who made up the marquee all-Spanish group with Arnaus, were a shot further back on five under alongside Marcel Siem, Andrea Pavan, Dean Burmester and Jamie Donaldson.
Sergio Garcia, who won the KLM Open on his last start, lies six shots off the pace following a 69.
It was a day to forget for the trio of Irish competitors, with Michael Hoey performing best with a round of 73.
Johannessen started his round from the 10th and birdied the 13th and 14th before holing out for an eagle on the par-four 15th.
The 24-year-old Norwegian dropped his only shot of the day by three-putting the 16th but birdied the next and picked up four more shots in his last six holes.
"It was a good round," Johannessen said. "I didn't hit it perfectly but hit it in the right spots, even when I missed, and I holed some good putts.
"I'm out there having fun and playing smart. It's a tricky course, but I've got a friend on the bag this week and we're having fun out there.
"I just need to keep calm, play my own game and not get stressed out there. It's a bit tricky, so if you get stressed you start easily making mistakes. I just need to keep cool and play my own game."
Defending champ opens with a 66 📽️@JonRahmpga #OpenES pic.twitter.com/Ccz9KvBTGd
— The European Tour (@EuropeanTour) October 3, 2019
Rahm, who can overtake Open champion Shane Lowry at the top of the Race to Dubai with a good performance in Madrid, carded six birdies and a solitary bogey in his 66.
"It was always a dream to win the Spanish Open and definitely a career goal of mine to be a multiple champion," the world number five said.
"I've not been able to successfully defend a title. I've been close, but not there, so hopefully I can make it happen this week. It's a challenge. Adri is playing good, if he keeps hitting it long and straight, he'll have a chance."
