Pinehurst, N.C. _ Martin Kaymer has reached 10-under par with a few holes left in his second round at the U.S. Open.

The last player to reach double-digits under par before the weekend at a U.S. Open? Rory McIlroy, when he set a record of 16-under when winning the 2011 U.S. Open at Congressional.

The last player before McIlroy to do it? Well, no one.

Kaymer reached 10-under on his 32nd hole of the U.S. Open. The only player ever to reach 10-under quicker was, again, McIlroy at Congressional.

It rained at Pinehurst on Thursday night, and that has led to more-receptive greens. Kaymer is hitting the ball so well he has had no trouble holding greens, and when he made a bad swing on the par-3 6th, he easily got up and down from the bunker.

He's threatening to make this a one-man tournament.

Former Gopher Donald Constable is two-over today after shooting an 81 in his first round. (I incorrectly called it an 82 earlier.)

Fellow former Gopher Clayton Rask tees off in about two hours.

I'll be on 1500ESPN at 12:15 from Pinehurst.