Kraft (70) wound up second, while Jason Kokrak (67) and Brandt Snedeker (64) tied for third at 13 under.
In his first win since the 2011 Justin Timberlake Shriners Hospitals for Children Open, Na lapped the field by five strokes, finishing the week at 19 under.
As Na was waiting to be interviewed by CBS Sports after the win, he received a text from Tiger Woods.
"I've been close so many times". "I have been close so many times".
Kraft said he struggled judging the speed of his putts.
"It's nice to get that second trophy", Na said. I got it just over the ridge. "Every time I got over the ball it felt great, and everything felt like it was going in". "I hit a lot of good shots today". Everything was going my way, and it was nice to have that big lead going up to the last hole and enjoying the moment.
Na was one shot behind co-leaders Kraft and Harold Varner to begin the day.
Russell Henley (a final-round-low 63) ended up alone in 10th, another shot in arrears.
Instagram Model Posing For Photo Amidst School Of Sharks Bitten By Shark
Katarina Zarutskie was floating calmly in the ocean off the Bahamas' Staniel Cay when she suddenly felt her arm being yanked down. While feeding a small group, Melissa Brunning was dragged into the water by her finger before breaking free.
Sei Young Kim shatters LPGA scoring records to win Thornberry Creek
Sei Young Kim has broken the previous 72-hole scoring record on the Tour, with a nine-shot win at the LPGA Classic in Wisconsin. Kim earned her full time status card on the LPGA Tour after finishing tied for ninth at the 2014 LPGA Qualifying Tournament.
Babies who started solids earlier slept better
The EAT study showed that introducing small amounts of allergenic foods to younger babies helped reduce food allergy risks. If there is any doubt about what's best for your baby, please seek advice from your doctor or health professional'.
Varner shot a four-under 66 on Saturday to tie Kraft at the top entering the final round of A Military Tribute at The Greenbrier. "It's been a tough year for me, just not playing up to where I think I'm capable of". Putting the work in, knowing I'm working as hard, if not harder, than I ever have. "Not playing ideal golf, Just going for targets and having fun with it", Varner said.
By the end of Friday's second round, though, the top of the leaderboard had thinned out a little bit. I've never seen this course this hard.
"And especially on the back nine, there were two or three greens that were just - they were borderline rolling too fast".
The three-time defending world champion took the overall lead of the Tour on Sunday after he bettered about a dozen other sprinters to win Stage 2. Tag Ridings (Arkansas Razorbacks) tied for 27th at 11 under, while Sebastian Cappelen (Razorbacks) tied for 41st at 8 under.
Bubba Watson shot 65 and was among three players at 11 under.
Phil Mickelson, in his first tournament since his freaky US Open final day meltdown on the 13th green, was penalised two shots on Sunday for improving his line of play.
Phil Mickelson made news again this week, and it was again not for his play but for a rules violation. Lahiri was bogey-free over the first two rounds but bogeyed the first two holes Saturday, shot 71 and dropped three strokes behind.
The PGA Tour now moves to Silvis in IL for the John Deere Classic where Bryson DeChambeau defends his title.