Jake Knapp withdraws from PGA Tour's Sony Open in Hawaii due to injury

Jake Knapp withdrew Thursday from the Sony Open in Hawaii before his first-round tee time due to a back injury.

Knapp, who won the Mexico Open last year for his first PGA Tour victory as a rookie, finished 56th last week at The Sentry. He participated in practice rounds this week, but the severity of his back injury is unknown.

He was originally scheduled to tee off at 5:50 p.m. ET off the first hole at Waialae Country Club playing alongside Brice Garnett and Tom Hoge.

On Sunday, Davis Riley WD'd which got Trevor Cone in, and Christiaan Bezuidenhout WD'd which opened a spot for Danny Walker. Then on Thursday, Michael Thorbjornsen withdrew, giving Lanto Griffin a spot.