K.J. Choi doubles lead during second round of Sony Open

K.J. Choi of South Korea hits his second shot on the 14th hole during the second round of the Sony Open at the Waialae Country Club on Friday in Honolulu, Oahu, Hawaii. PHOTO: AFP

South Korea's K.J. Choi doubled his lead to two shots on Friday with a five-under par 65 in the second round of the US$5.3 million Sony Open.

Choi, trying to rebound from a disappointing finish in the season-opening Mercedes Championships last week, carded a five-under 65 for a two-stroke halfway lead over American Kevin Na.

Choi teed off on the 10th, and picked up two strokes by the turn. He gave back a stroke at the par-four second, but birdied four of his last five holes -- including three in a row to cap the round.

Added to his bogey-free six-under effort on Thursday, Choi had a 36-hole total of 11-under 129.

Choi said he knew last weekend that his game was shaping up, although he hadn't come into this week with any expectations.

"After the third round [last week], I really found my rhythm coming back," he said.