Lynn birdied the par-3 eighth hole and had a 3 on the par-4 ninth to close his first round with a 6-under-par 65.
He was the only player to finish with back-to-back birdies but Alvaro Quiros, Simon Thornton, Maximilian Kieffer and Graeme Storm all birdied the last hole they played Thursday to get a share of the lead.
Even more players -- nine -- are tied one stroke off the lead and 13 are at 4-under. That leaves 29 players within two strokes of first place after the first round.
Kieffer was the only player among the leaders to go bogey-free in the first round. He started on the back nine of the Oceanico Victoria Golf Course. He had an eagle at the par-5, 593-yard 12th and added four birdies on the front nine.
Lynn, Donaldson, Thornton and Storm each had just one bogey Thrusday and Aguilar and Quiros had two apiece.