Collin Morikawa Starts Falling Short.

The reigning PGA champ was battering the diabolical course that drives most players batty with eight birdies in his first 12 holes and headed to the 13th tee with a five-shot lead.

But Morikawa limped home with two bogeys and was forced to make two gut-check par putts to remain in the lead.

Morikawa, who made nine birdies in his second round, still signed for a 5-under-par 67 and his once imposing lead is down to two through 54 holes.

“Got off to a really good start and just kept rolling birdie after birdie, really didn’t think about it, game was playing really boring, playing simple, hitting fairways and hitting greens,” Morikawa said.