Day, who has developed a friendship with Woods off the course, said the American great reached out to him following a seven-over 79 during the first round at Erin Hills.
Woods is currently recovering from his latest back surgery and admitted he is receiving help for managing his prescription drugs after a DUI arrest last month.
"He texted me after I shot 79 and said, 'Hey, before you work on something call me because I saw something,'" Day said, via GolfChannel.com.
"I was like, yeah, you saw 79 shots. I didn't call him because I was so angry.