The German ended the first round three shots clear of a group of four players, and picked up where he left off to extend that lead to eight at the end of his second round at Pinehurst.
Kaymer has one major to his name already, the 2010 PGA Championship, but is looking to improve on his best US Open finish of tied eighth.
Birdies at three and five gave the 29-year-old the perfect start, and he made the turn at 33 to stay clear at the top.
Kaymer then picked up three further shots at the back nine to lead in the clubhouse on 10 under, with his successive rounds of 65 enough to break Rory McIlroy’s 36-hole scoring record at the US Open.
Many of Kaymer’s rivals began their second round later, with American duo Brooks Koepka and Dustin Johnson among a group of six players tied for second on two-under par.
Keegan Bradley and Brendon De Jonge also moved to two under with respective rounds of 69 and 70, while Kevin Na and Graeme McDowell are in the early stages of their second rounds.
Meanwhile, there was drama on the 18th fairway as Jamie Donaldson and Hunter Mahan both earned two-shot penalties.
The pair accidentally played each other’s balls following their tee shots, and that error could prove particularly costly for Mahan.
Mahan subsequently posted a round of 72, which leaves him six-over par for the tournament – one shot more than the current projected cut.
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