Dustin Johnson satisfied after difficult first round

Dustin Johnson battled through tough conditions to end the first round in a four-way tie for the lead at the U.S. Open.

Dustin Johnson   -  Warren Little/Getty Images

Dustin Johnson said he was happy to end the first day of the U.S. Open under par after a challenging start to the second major of the year.

Johnson, the world number one, finished the first round in a four-way tie for the lead at one under with Scott Piercy, Ian Poulter and Russell Henley.

Tough conditions played their part in New York with gusty winds providing a stern test for the world's best golfers, but Johnson was happy with the focus he showed.

"I'm very pleased with the round. Anything under par on this course is very good, especially in the conditions we have today. I felt like from start to finish it was very difficult," he said.

"I had to focus on every single shot I hit, putts, everything. It was difficult all day."

The American won the St Jude Classic last week and is looking to become the first player to win the U.S. Open having claimed a victory the week prior.

Johnson, 33, is hopeful that momentum can continue throughout the weekend at Shinnecock Hills.

"Obviously coming off a win, you've got a lot of confidence," he said.

"I feel like I've been playing solid [golf] all year, just haven't really been getting a lot out of my rounds.

"Last year I played well and scored well and that's what I did today.

"Tomorrow is going to be another difficult day and I'll have to shoot the same kind of quality golf shots if I want to shoot another good score."