Chris Kirk turns 34 on Wednesday and feels as though he is starting over in what he calls a "new and better chapter in my life."
Kirk posted a message on Twitter revealing he has dealt with alcohol abuse and depression and thought he could control it on his own.
"But after multiple relapses, I have come to realize that I can't fix this on my own," Kirk said. "I will be taking an indefinite leave from the PGA Tour to deal with these issues. I don't know when I will be back, but for now I need my full focus on being the man my family deserves."
Kirk is a four-time winner on the PGA Tour, his most recent victory at Colonial in 2015. That was the year he holed a 15-foot birdie putt on the 18th in South Korea that was the most pivotal in a one-point victory for the Americans.
"It takes a great deal of courage to talk publicly about issues such as mental health and substance abuse, and the entire PGA Tour family stands with Chris Kirk in taking this difficult first step toward his recovery and well-being," PGA Tour Commissioner Jay Monahan said.