Patrick Reed clinched the Farmers Insurance Open title with a dominant five-stroke triumph at Torrey Pines.

Reed carded a four-under-par 68 in the final round to claim the largest margin of victory of his career on Sunday.

American star Reed and Carlos Ortiz had shared the lead heading into the deciding day in San Diego, where the former starred on the South Course.

Reed posted an eagle, three birdies and a bogey to be 14 under overall for his ninth PGA Tour trophy – with his 2018 Masters success among the honours.

The victory marked the 50th top-10 performance of Reed's Tour career. The last five players to reach that milestone with a win also include Jason Day (2016), Bubba Watson (2016), Rocco Mediate (2002) and Phil Mickelson (2000).

"My biggest takeaway was mentally, I hung in there and stayed the course," Reed said afterwards, following a rules furore on Saturday.

"... We felt like we did [the right thing], the rules officials felt like they did that at the same time so with that being said I felt fine, I felt great throughout the day. And at the end of the day, I wouldn't have felt any other way.

"I was able to shoot a low number [Sunday] and get the job done."

Tony Finau (69), Henrik Norlander (69), Ryan Palmer (70), Xander Schauffele (69) and Viktor Hovland (71) finished tied for second, while Will Zalatoris (71), Lanto Griffin (72) and John Rahm were a stroke further back and six shots behind.

Four-time major champion Rory McIlroy faded as he ended the tournament in a share of 16th position at six under.

McIlroy's final-round 73 included a double-bogey, two bogies and three birdies in a mixed bag for the Northern Irish star.