AUGUSTA – South Carolina’s Dustin Johnson was in the Masters lead all by himself today before falling apart on the back nine. Johnson shot a 76 and is 1 under par for the tournament, a collapse of six shots over the last five holes.

A double-bogey on the par 5 No. 15 hole and another at the par 4 No. 18 sent Johnson crashing down the leaderboard.

Johnson, 28, grew up in Columbia and played at Coastal Carolina. He lives in Myrtle Beach.

Johnson shot an opening round 67 on Thursday to finish one shot off the lead.

He has finished in the top eight in the three other majors, including the 2010 PGA Championship. Johnson had a 2-shot lead to the final regulation hole of that tournament, but he grounded his club in a nebulously designated “waste area.” The controversial 2-stroke penalty cost him a spot in a playoff in which Martin Kaymer edged Bubba Watson.

Again Friday, Johnson’s gallery included girlfriend Pauline Gretzky, daughter of hockey “Great One” Wayne Gretzky.

Glover shoots 74-74

Lucas Glover, the former Clemson player and 2009 U.S. Open champion, bogeyed the last two holes today to finish at 74 for the second straight day.

Glover after four birdies Thursday had only one Friday, on the par 4 No. 5 hole.

“Poor putting and finished poorly, that was the tale of the tape. Both rounds,” Glover said. “It was almost identical. I hit the ball fine, but I’m not making any (putts).”

Follow Gene Sapakoff on Twitter @sapakoff