Round 2 of PGA in the rain at Baltusrol

Henrik Stenson watches his tee shot on the first hole during the first round of the PGA Championship golf tournament at Baltusrol Golf Club in Springfield, N.J., Thursday, July 28, 2016. (AP Photo/Tony Gutierrez) (The Associated Press)

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Martin Kaymer watches his tee shot on the third hole during the first round of the PGA Championship golf tournament at Baltusrol Golf Club in Springfield, N.J., Thursday, July 28, 2016. (AP Photo/Tony Gutierrez) (The Associated Press)

Fans watch as golfers play not he fourth green during the second round of the PGA Championship golf tournament at Baltusrol Golf Club in Springfield, N.J., Friday, July 29, 2016. (AP Photo/Tony Gutierrez) (The Associated Press)

SPRINGFIELD, N.J. – The weather matched the mood of Dustin Johnson and others trying to make up ground Friday in the PGA Championship.

Jimmy Walker took a one-shot lead into the second round at Baltusrol and did not play until the afternoon. Johnson was the biggest surprise of the opening round when the U.S. Open champion had a pair of double bogeys and only one birdie on his way to a 77.

He stood outside the clubhouse as a steady rain fell, knowing he had to make up ground to avoid missing his first cut in nearly 18 months on the PGA Tour.

Two-time major winner Martin Kaymer was one shot behind, and British Open champion Henrik Stenson was two shots back. Both played in the morning.