Round 2 at the 2011 U.S. Open at Congressional

1 of 16 David Cannon/Getty Images

Rory McIlroy started the day with a three-shot lead.

2 of 16 Kohjiro Kinno/SI

will miss the cut after a 5-over 77.

3 of 16 Kohjiro Kinno/SI

is in second place, but he trails McIlroy by six shots.

4 of 16 Simon Bruty/SI

shot a 3-over 74 to fall back to even par.

5 of 16 Simon Bruty/SI

Mickelson made it to one under for the tournament before hitting into the water on 18. He finished with a double-bogey and a round of 69.

6 of 16 Fred Vuich/SI

played far better in the second round than he did in the first.

7 of 16 Nicholas Kamm/AFP/Getty Images

In addition to five birdies in the second round, McIlroy holed out for eagle on the short par-4 8th hole.

8 of 16 Simon Bruty/SI

He made it 35 holes without a bogey until he rinsed his approach shot from deep rough on 18, ending with a double-bogey 6.

9 of 16 Fred Vuich/SI

fired a 5-under 66 for a 36-hole total of 11 under — the lowest 36-hole score in the 111-year history of the U.S. Open.

10 of 16 Fred Vuich/SI

used his small putter well on Friday. Garrigus is tied for third at two under par.

11 of 16 Simon Bruty/SI

Johnson continued to struggle on Friday, finishing at four over for the tournament.

12 of 16 Simon Bruty/SI

McIlroy and Mickelson played with Dustin Johnson the first two rounds.

13 of 16 Rafael Suanes-US PRESSWIRE

Mickelson went three-under on the front nine to get back to even par for the championship.

14 of 16 JONATHAN ERNST/Reuters

shot a 71 and is two under for the event.

15 of 16 Jamie Squire/Getty Images

shot a 73, dropping to five over for the tournament.

16 of 16 Kohjiro Kinno/SI

missed the cut after rounds of 76-77, but the 16-year-old has plenty of U.S. Opens in his future.