Jason Day (65) still protecting bad back at PGA Championship

SAN FRANCISCO – Tiger Woods’ fragile back was a hot topic heading into this week’s PGA Championship with temperatures hovering around 50 degrees and a thick fog blanketing TPC Harding Park, but Woods isn’t the only player in the field with a balky back.

Jason Day has been spotted in recent weeks slowly plucking his golf ball from the hole in an attempt to protect against re-injuring his back, and he had his share of concerns heading into what promised to be a frigid round on Thursday. Instead, the sun broke through the fog around midday and temperatures climbed into the mid-60s.

“It was nice to be able to have the sun for a change. I mean, it's been kind of overcast and gray here,” Day said.…