Garrigus piled up eight birdies in an 11-hole span in getting to 14-under 128. That score would have been a 36-hole tournament record but conditions allowed players to use clean-and-place rules.
Jbe Kruger, who matched the 64 by Garrigus, moved into second at 12-under.
Garrigus opened his round with six pars but then ran off four consecutive birdies. After a par at the par-5 11th, Garrigus made birdies at 12 and 13. A birdie at the 15th got him to 7-under. He added another birdie at 17 but had a par putt stop short and he had a bogey at the 18th.
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