Patrick Reed has said that he could have had a "four or five-shot lead" at the halfway point of the US Open at Chambers Bay.
The American holds a share of the lead with Jordan Spieth, but the world number five has revealed that he was frustrated with his efforts in the second round, despite shooting a one-under-par score of 69.
The 24-year-old is quoted by Sky Sports News as saying: "I actually felt it was a pretty disappointing round. To have six bogeys, I didn't get up and down once.
"I need to clean that up. Now I feel like I'll go make a birdie and then give it right away. You can't do that here. If I didn't do that, I would have a four or five-shot lead."
Reed's only previous US Open appearance saw him finish in a tie for 35th place last year.
