(Reuters) - Defending champion Jordan Spieth and fellow Americans Zach Johnson and Bryson DeChambeau will form an eye-catching grouping for the first two rounds of next week's U.S. Open in Oakmont, Pennsylvania. World number two Spieth, who won last year's title by one shot after a thrilling finish at Chambers Bay, reigning British Open champion Johnson and DeChambeau will start Thursday's opening round on the 10th tee at 8:35 a.m. ET. The all-American trio will then set off from the first tee at 2:20 p.m. in Friday's second round at Oakmont Country Club.
