Bernhard Langer shot a 2-under 70 to take a three-shot lead after the second round of the ACE Group Classic.
Langer, who had a 10-under 62 in the first round, picked up where he left off with a birdie on his first hole. He made 11 straight pars after that, birdied No 13, and had a par on the last five holes in windy conditions. He is at 12-under 132.
Taiwan's Lu Chien-soon and Tom Pernice Jr, who was runner-up last week in Boca Raton, are tied for second at 9-under 135.
Lu double bogeyed the first hole, then birdied seven of the next 10. He bogeyed No 18. Pernice had four birdies and a bogey. He birdied two of his last six holes.
The wind picked up just before the leaders teed off and only got stronger as the day went on, gusting to 30 mph (48 kph).
The 55-year-old Langer won this seniors event in 2011 and was runner-up last year.
Mark O'Meara was next at 8 under. Mark Wiebe, Jay Don Blake and John Huston are another stroke back.
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