Donald opened his round with a bogey but got back to even with a birdie at the fifth hole. He started a charge with birdies at Nos. 7 and 8 and then eagled the par-5, 653-yard ninth hole. He added another eagle 3 at the 562-yard 16th hole and pulled into a share of the lead with a birdie at 17.
Davies and Donaldson, who both started on the back nine Thursday, each were bogey-free on the day.
Davies had a birdie at No. 13 and three times beat par on back-to-back holes, recording birdies at Nos. 15-16, 2-3 and 7-8.
Donaldson opened with a birdie at 10, finished his first nine with birdies at 17 and 18. He also had birdies at Nos. 3 and 5 before matching Davies with birdies at Nos. 7-8.