But because Johnson had yet to tee off, the ball was not technically in play when he made his swing, meaning the ruling came down to his intent.
-Accidentally strikes the ball when making a practice swing or while preparing to make a stroke.
Johnson was standing on the 13 tee at even par for the day after a bogey on 12, when he took a practice swing with his driver, and accidentally made contact with his ball that was on the tee. It was so bad that it richocheted off the tee marker then popped in the air right in front of him.
Luckily, the 43-year-old emerged unscathed - pride not withstanding - as no penalty was applied and he went on to birdie the 13th hole.
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The most impressive part of the sequence is that Johnson then stepped up and bombed a flawless drive down the middle of the fairway.
After 13 holes of play, Johnson now sits at one-under for the day and one-over for the tournament. "I actually hit a really good tee shot after that, so I think I recovered nicely".
"I can't think of a time I've done it - not on objective", Johnson said of hitting the ball during a practice swing.
Playing partner Ian Poulter revealed he was a little bit "shocked", although he admitted he didn't actually see what happened as he was getting a drink out of his bag. The 2007 Masters champ bounced back in the early going on his second round, moving to one-over par on several occasions.