FINAL ROUND SCORES: (US unless stated)
-13 T Woods -12 H Mahan -9 A Kim -8B Molder -7B Snedeker, L Glover
Selected others: -4 J Rose (Eng) +11 B Davis (Eng), M Laird (Sco)
Woods managed a 20-foot birdie putt on the 16th hole to take the lead
Tiger Woods clinched his 68th PGA Tour win at the PGA National in Maryland, despite a superb last-round surge from fellow American Hunter Mahan.
Tournament host Woods, who shared the overnight lead with Anthony Kim, took the title by one shot after recording a three-under 67 for a total of 13 under.
Mahan equalled the course record with a 62 to tie for the lead before Woods pulled clear with a birdie at the 16th.
Kim finished on nine under - a shot ahead of Bryce Molder.
The highest placed Briton was Justin Rose, who carded a one-under 69 on his final round to finish at four under for the tournament.
It was Woods' third win of the season, having triumphed at the Arnold Palmer Invitational and Jack Nicklaus' Memorial in June.
"This golf course is not easy and we only have basically one real birdie chance coming in, which was 16," said Woods, who sunk a 20-foot birdie putt on the 16th hole.
"At the very end it started going left and it was like, 'Oh God just don't lip out now'. It went in."
Mahan matched the 18-hole course record of an eight-under 62, which was set in Thursday's opening round by fellow American Anthony Kim, to storm into the clubhouse lead.
"It was kind of in Tiger's court there," stated Mahan.
"The first three days were a little ugly. I swung great all week but today the putting was great. I'm just really proud of the way I finished."
Woods conceded he was surprised to see Mahan come from nowhere to challenge for the title.
"I don't know what golf course he was playing. I didn't see a 62 out there," added Woods.
"He put so much pressure on us. We had to play really well. There was a lot of heat back there."
The world number one finished sixth at the Masters and US Open this year after coming back from knee surgery but hopes to better that position in a fortnight when he takes part in the Open at Turnberry.