Jason Day, Taylor Pendrith WD from John Deere Classic

Former world No. 1 Jason Day of Australia and Taylor Pendrith of Canada withdrew from the John Deere Classic on Thursday.

Day, who is now 137th in the Official World Golf Ranking, exited with a back injury. He was replaced in the field by Ted Potter.

The 34-year-old Day has 12 PGA Tour victories, including the 2015 PGA Championship. He also finished tied for second in the 2011 Masters in addition to posting second-place