Edfors had nine birdies and one bogey at the Royal Golf Club and is two strokes up on four players tied for second while another eight finished the first round at 5-under 67.
Edfors opened his round with a birdie at the 10th hole and got to 3-under with back-to-back birdied at 14 and 15. His long bogey came at the 16th hole but answered with another birdie at No. 17.
He had five birdies on the front side, closing with birdies at Nos. 8 and 9.
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