Na has played on the Asian Tour (with a win at the 2002 Volvo Masters of Asia), European Tour, Nationwide Tour (with a win at the 2006 Mark Christopher Charity Classic), and PGA Tour (with a win at the 2011 Justin Timberlake Shriners Hospitals for Children Open). In 2009 he had nine top-10 finishes and finished in 19th place on the money list, securing his entry to The Masters and the U.S. Open for the first time.

In February 2011, Na was in contention to win his first PGA Tour title at the Northern Trust Open. He entered the final round in a tie for 2nd at -9, one stroke behind the Australian Aaron Baddeley. However a run of four bogeys in the first ten holes ended Na's chances of victory. He would eventually fight back on the back nine and a vital birdie on the par-five 17th sealed a top-three finish, behind eventual winner Baddeley and the Fijian Vijay Singh.

On April 14, 2011, Na played the worst ever par 4 hole on the PGA Tour since the tour began recording hole-by-hole scores in 1983, making a 16 on the ninth hole at the Valero Texas Open. Na needed extra shots after an unplayable lie from his tee shot and was then given a two stroke penalty after his ball hit a tree and rebounded back onto him. It was initially scored as a 15 but changed to 16 on review. Na ended up shooting an eight-over-par round of 80, which saw him shoot four-under for his other 17 holes.

On October 1, 2011, Na apparently whiffed his tee shot on the par-4 15th hole in the third round of the Justin Timberlake Shriners Hospitals for Children Open at TPC Summerlin in Las Vegas, missing high and to the outside of the ball. Tour officials, though, ruled Na was not intending to hit the ball and did not count the swing as a stroke, and Na finished with a 5-under 66 to remain tied for the tournament lead. The following day, Na earned his first PGA Tour victory at the 211th attempt, having been on tour for eight years. He shot a final round 65 with birdies at 15, 16 and 17 to win by two strokes from Nick Watney and earn $792,000 in prize money. Na also broke the tournament scoring record of 21-under par when he finished the week at 23-under par. This victory earned Na a two year exemption on tour.

A back injury limited Na to eight starts in 2013. After rehabbing, he made a comeback in his first start since April with a T3 finish at the Frys.com Open. Na was given eighteen starts on a medical extension, but needed only seven.

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