PINEHURST, N.C. -- Martin Kaymer set a U.S. Open record Friday with a game so dominant that he did more than just build a six-shot lead.

He managed to bring Tiger Woods into the conversation at a major he's not even playing.

Kaymer opened with a short birdie and rolled his way to a second straight round of 5-under 65 -- this one without a bogey. He set the 36-hole scoring record at 10-under 130 and left the rest of the field wondering if the 29-year-old German was playing a different course, or even a different tournament.

"If he does it for two more days, then we're all playing for second spot," said Adam Scott, the world's No. 1 player.

Such talk once was reserved for Woods, still home recovering from back surgery.

Kaymer played early on a Pinehurst No. 2 course that received a burst of showers overnight. That red 10 on the leader board next to his name was a daunting sight the rest of the day.

"I heard he played the No. 3 course. Is that true?" Kevin Na said after a 69 put him seven shots behind. "It's unbelievable what he's done. Is 4 or 5 under out there? Yes. Ten under out there? No. I guess it was out there for him."

Brendon Todd kept this from really getting out of hand. He made two tough pars from the bunker late in his round for a bogey-free 67 to get within six shots, putting him in the final group on the weekend in his first major.

"Kaymer's performance has been incredible," Todd said. "He's playing a brand of golf that we haven't seen probably in a long time, since maybe Tiger."

Kaymer tied the record for the largest 36-hole lead at the U.S. Open, first set by Woods at Pebble Beach in 2000 and matched by Rory McIlroy at Congressional in 2011.

Woods went on to win by 15 shots. McIlroy set the 72-hole scoring record and won by eight.

"I played Congressional and I thought, 'How can you shoot that low?' " Kaymer said. "And that's probably what a lot of other people think about me right now."

Brandt Snedeker had a 68 and joined Na at 3-under 137. Only nine others were under par going into the weekend.

It looks like a typical U.S. Open -- except for Kaymer.

Starting on the back nine, Kaymer hit wedge into 5 feet for birdie on the par-5 10th. He made birdie putts from 20 and 25 feet, and then hit a gorgeous drive on the par-4 third hole, where the tee was moved up to make it play 315 yards. His shot landed perfectly between two bunkers and bounced onto the green to set up a two-putt birdie. And the lead kept growing.

"I look at the scoreboards. It's enjoyable," said Kaymer, who won the 2010 PGA Championship. "To see what's going on, to watch yourself, how you react if you're leading by five, by six. I don't know, but it's quite nice to play golf that way."

Even with a big lead, Kaymer did not consider changing his strategy.

"Because if you think of defending anything, then you're pulling back, and that's never really a good thing," he said. "You just want to keep going."

  • Phil Mickelson, a six-time Open runner-up, shot a 3-over 73 that left him at 3 over -- 13 shots behind Kaymer. Mickelson ditched the claw grip in favor of a more traditional one but still missed a series of putts. "The hole looks like a thimble to me right now," he said. "I'm having a hard time finding it."

  • Scott shot a 3-under 67 that marked his best score at a U.S. Open. That moved him to even-par 140 -- 10 shots behind Kaymer. Masters champion Bubba Watson missed the cut by a stroke after a second-round 70 and 146 total.

  • Cameron Wilson, the 2014 NCAA individual champion, shot an even-par 70 for an 8-over 148. Stanford teammate Maverick McNealy had a 76 for a 150. Only one amateur made the cut -- Matthew Fitzpatrick, who was 4 over after a second-round 73. Fitzpatrick is scheduled to make his pro debut next week at the Irish Open. The 19-year-old Englishman won the U.S. Amateur last year.

  • Hunter Mahan was penalized when he and Jamie Donaldson each mistakenly played the other's ball in the 18th fairway following their tee shots. That two-shot penalty dropped Mahan (72) below the cut line at 146. John Wood, Mahan's caddie, took the blame because he was the first one to reach the ball. "You can't imagine doing something colossally as stupid as that, but I did it," Wood said. Donaldson also missed the cut at 151.

    LEADER BOARD

    After second round
    At Pinehurst No. 2, par 70

    Player Scores Par
    Martin Kaymer 65-65 -- -10
    Brendon Todd 69-67 -- -4
    Kevin Na 68-69 -- -3
    Brandt Snedeker 69-68 -- -3
    Five players tied at 2 under
    Notables
    Rory McIlroy 71-68 -- -1
    Phil Mickelson 70-73 -- +3