The Latest on the PGA Championship (all times local):

7:45 a.m.

More than an inch of rain fell at Baltusrol overnight, and it kept right on falling as the second round began in the PGA Championship.

Of greater concern to Dustin Johnson is the 12-shot gap between him and 18-hole leader Jimmy Walker. The first order of business for the U.S. Open champion is making the cut.

The adage in golf is that players can't win a major on Thursday, but they can lose it.

The record for largest comebacks after the opening round at the PGA is eight shots by three players, most recently Keegan Bradley in 2011 at Atlanta Athletic Club. Then again, Bob Tway was nine shots behind after 36 holes when he won at Inverness.

Rory McIlroy opened with a birdie-free 74. The PGA record for highest start by a winner is 75 by John Mahaffey in 1978 at Oakmont.

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7 a.m.

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.