Ernie Els has already cut into Jordan Spieith's lead at the Masters, making a birdie at the second hole to pull within two strokes of the top spot.
On an overcast morning at Augusta National, the South African started play Friday with possible storms in the forecast.
Jordan Spieth tees off in just before 10 a.m. EDT.
Spieth is loosening up in the practice area after opening Thursday with an 8-under 67, which gave him a three-stroke lead on Els, Justin Rose, Jason Day and Charley Hoffman.
Day and Hoffman also have morning tee times. Rose goes off in the early afternoon.
Tiger Woods, nine shots back a 1 over, begins his second round at 10:30. He's trying to avoid missing the Masters cut for the first time in his pro career.