Both played only six holes, finished when breakfast was still being served in the Riviera clubhouse, and were likely to play only a few holes of third round in what daylight was left.
They were a shot ahead of J.B. Holmes (69). Jordan Spieth (70) was three shots behind, while Tiger Woods finished with a birdie for a 71 and was 10 shots behind.
The start of the tournament was delayed seven hours because of rain. The plan was to complete the third round Sunday morning and keep the same groups for the final round immediately after.
Thomas and Scott were at 11-under 131.