Zach Johnson is tied for the lead at the John Deere Classic

      Zach Johnson, Rory Sabbatini and Brian Harman shot 8-under-par 63s Thursday to share the lead after the first

      round of the John Deere Classic.

      Johnson and Sabbatini played bogey-free golf, while Harman had nine birdies and one bogey on the par-71 TPC Deere Run.

      They led 2004 British Open champion Todd Hamilton, Australian Steven Bowditch andWilliam McGirt, the best afternoon finisher, by a stroke.

      Johnson, who won the Deere in 2012 and lost it to Jordan Spieth in a playoff last year, birdied four of his first five holes and was 6

      under on his opening nine.

      Harman, who bettered his best round of the year by two strokes, was 2 under through six holes when his caddie, Scott Tway, took ill. Jay

      Hatch of Davenport, Iowa, a high school basketball coach, volunteered from the gallery, and carried Harman's bag the last 12 holeswhich

      Harman played in 6 under.