Glover was three over par for the round after nine holes, but held on to a one-stroke lead after nine holes. Ricky Barnes stumbled through a plus-five opening nine and was a stroke behind Glover at the turn.
Six golfers, including Phil Mickelson and Tiger Woods, were within four strokes of the lead.
Woods was one-under par for the day and at even par for the tournament through 16 holes.
Mickelson was two under for the tournament through 12 holes.
Glover dropped three shots on the front side and was 4 under, while Barnes made four straight bogeys starting at No. 5 to continue a freefall that started Sunday afternoon. Neither leader had a final-round birdie before making the turn.
Barnes led by six shots at one point yesterday, 15 ahead of Woods.