Rory McIlroy is confident that Martin Kaymer can press home his advantage as he holds a six-shot lead at the halfway stage of the US Open.
The German posted a round of 65 for the second consecutive day on Friday leaving him on 10-under par for the tournament meaning he has equaled the lowest halfway score in a major championship history.
The 29-year old is six shots clear of nearest challenger American Brendon Todd as they enter the weekend.
McIlroy, who is nine shots behind leader Kaymer, held the previous halfway record at the US Open after shooting 131 in 2011 when he went onto win the event at Congressional.
The Northern Irishman believes that Kaymer will only need two level-par round to win his second major trophy and doesn't believe there will be only slip-ups.
"If I was Martin, hopefully I would be thinking about how to get seven ahead and then how to get eight ahead and then how to get nine ahead," said McIlroy.
"Especially on a golf course like this, you can't go out trying to protect anything. You've just got to keep the foot to the floor and just keep it going. If he's comfortable out here and making birdies, then that's what you should still be thinking of.
"Ten under par is an incredible total after 36 holes and, if he can hold on to that 10-under total, he's going to win this tournament."
McIlroy also referenced when he took a four-shot lead going into the final round at Augusta in 2011 before carding a final round of 80.
"I learned at the Masters, the previous major before Congressional, if you get too defensive, it's detrimental."
The 25-year old also admitted that he is satisfied with his his opening two rounds and is looking forward to playing over the weekend.
"If I have a couple more 68s, I would take my chances. With a five-under total I would sit in the clubhouse happily with that.
"If someone had told me at the start of the week that I was going to be standing here one under par after 36 holes, I would have taken it. I would have said, 'perfect, let me play the weekend and see what happens.'"
“But what Martin has done over the first couple of days has made one under par look pretty average.
"But I'm happy with where my game is and there's a lot of golf left to play. So we'll see what happens over the weekend."
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