"I thought it was a very good round, although I was pretty nervous at the beginning", said Diaz, who played alongside Stewart Cink and local favorite Steve Stricker.
Not everyone, however, took advantage of the ideal morning conditions.
"There's nothing I can hide behind", Day said.
"It was just a really fun round", said Casey, who said he was far from ideal and made errors.
McIlroy later attributed his poor showing to "rust" given he has not competed since finishing mid-field last month in the Players Championship. But I've definitely got to roll it better. Seven under is ridiculous.
The question now is whether he can keep it up on a course that figures to get tougher as the week goes on, especially once it dries out and United States Golf Association officials conspire to make things more hard for the golfers.
Among the notable players who had early tee times, defending champion Dustin Johnson struggled to a 3-over-par 75.
"I had two triples out there, that obviously doesn't help, " Day told reporters.
Day's explanation was more concise: "I just played bad golf, man".
Special Counsel Is Investigating President Trump For Obstruction Of Justice
Here, Trump appears to be directly referring to arguments for firing Mueller from Newt Gingrich and other right-wing infotainers. A close Trump associate said this week the president was considering firing Mueller , although the White House later denied it.
Schauffele had a chance at birdie and a share of the lead with Fowler on his final hole, but pushed his putt just wide to lock him into a second-place tie with Casey. I had 15 looks at birdie and all of them were actual makeable putts and I only made one of them.
The last time Mickelson was runner-up at the U.S. Open was in Merion in 2013, the week Amanda graduated from the eighth grade. He was in California for his daughter's high school graduation, hopeful for enough of a weather delay to jet across the country to Wisconsin.
I was teeing off and I looked up and saw it on fire, and I felt sick to my stomach.
The USGA statement says the pilot is being treated for unknown injuries and that no other people were involved.
Mary Ruediger, 45, was visiting her parents who live along an access road to the golf course and spotted the blimp going down.
With only a gentle breeze and rains having taken the bite out of the monstrous 7,845-yard course, players tore apart the links-style layout, attacking the pins with bravado on a day when 17 competitors broke 70. Length wasn't the issue.
Tall fescue grass on the fourth, 12th, 14th and 18th holes was being cut on Tuesday as McIlroy gave his pre-tournament press conference, which caught the 2011 champion by surprise. The fastest the greens will roll all week is about 12.
The U.S. Open will be played next year at Shinnecock Hills, where Mickelson was in position to win in 1995 and 2004.
Mary Ruediger was visiting her parents who live near Erin Hills golf course when the blimp went down nearby Thursday.
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