J.J. Spaun's first career round in the Open Championship was off to a rollicking start on Thursday, the U.S. Open winner going out in one-under 35 at Royal Portrush. Unfortunately, it ended on a semi-sour note.

Golf's oldest championship begins Thursday and SI Golf writers and editors share their picks for a winner at the season's final major.

That’s because the Open is a bundle of chaos, where the players are competing against the conditions as much as one another, and that levels the playing field. It’s no wonder that the British Open has produced several long-shot winners in its history.