Dustin Johnson on course, opens with a par

Dustin Johnson is on the course at Erin Hills to start the defense of his U.S. Open title.

He opened with a tricky par save on the par-4 10th hole, getting up and down from a sliver of tangled rough after he hit his approach past the green.

He is playing with the 2014 and 2015 titlists, Martin Kaymer and Jordan Spieth. Kaymer opened with birdie and Spieth made par.

Johnson is trying to become the first player to go back-to-back at the U.S. Open since Curtis Strange in 1988-89.

Rickie Fowler is among a group of five players sharing the early lead at 2 under. Talor Gooch got to 3 under but bogeyed the par-5 seventh to fall back into the tie.