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Martin Kaymer shoots bogey-free 67, pulls 5 shots clear at Abu Dhabi Championship

  • Martin Kaymer of Germany tees off on the 13th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)

    Martin Kaymer of Germany tees off on the 13th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)  (The Associated Press)

  • Martin Kaymer of Germany tees off on the 11th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)

    Martin Kaymer of Germany tees off on the 11th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)  (The Associated Press)

  • Alexander Levy of France tees off on the 14th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)

    Alexander Levy of France tees off on the 14th hole during the second round of the Abu Dhabi Championship golf tournament in Abu Dhabi, United Arab Emirates, Friday, Jan. 16, 2015. (AP Photo/Kamran Jebreili)  (The Associated Press)

Three-time winner Martin Kaymer tightened his grip on the Abu Dhabi Championship on Friday, shooting a 5-under 67 to pull five strokes clear midway through the second round.

Two brilliant shots from the sand were the highlights for the overnight leader, who chipped in from a greenside bunker on his 10th hole and set up his fifth and last birdie with a 105-yard approach to eight feet from a fairway bunker on his 17th.

By following up a first-round 64 to lie on 13 under overall, Kaymer is 100 under par for his last 30 rounds on the National Course — where he won in 2008, '10 and '11.

Kaymer led by one shot overnight.

France's Alexander Levy is Kaymer's closest challenger on 8 under after shooting 70.