Jason Anthony Day (born 12 November 1987) is an Australian professional golfer. Day had early success on tour, winning the HP Byron Nelson Championship in his third season and recording runner-up finishes at the Masters and U.S. Open the following year. In 2015, Day recorded his breakout season, winning five events including the PGA Championship and ascending to #1 in the world. Since the end of 2016, Day's play has been much more erratic as he fell outside of the top 100 in the world. In 2023, however, he recorded a comeback year, winning the AT&T Byron Nelson, the site of his first win, and returning to the world's top 20.
