Play began at 10:30 a.m. local time (0630 GMT), almost three hours behind schedule, with 60 golfers - including four of the world's top six - still to finish their second round following a similarly late start on Friday.
The third round will begin no earlier than 1 p.m., so the likes of Masters champion Jordan Spieth, four-time major winner Rory McIlroy and talented amateur Bryson DeChambeau could again struggle to get round the course in time. Dusk is around 6 p.m.
England's Andy Sullivan, who has completed 36 holes, was the overnight leader on 10 under, with DeChambeau a stroke adrift after playing 27 holes.
(Reporting by Matt Smith; Editing by Peter Rutherford)
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