Tiger Woods believes that he could have got more from his second round at the US Open.

The 37-year-old, who is struggling with an elbow injury, shot an even-par 70, which sees him just four shots off the lead on three-over-par.

Woods said that, despite making a few mistakes around Merion, his game is in good shape heading into the third round.

"I played well," Woods told reporters. "I just made a couple of mistakes out there today, but I really played well.

"Maybe I could have gotten one or two more out of it, but it was a pretty good day. We have a long way to go, and these conditions aren't going to get any easier."

Billy Horschel and Phil Mickelson are tied for the lead on one-under-par.