At the age of 23 Spieth has become the youngest player since Tiger Woods to win nine PGA Tour Titles when taking out the AT&T Pebble Beach Pro-Am, but had to wait over a year for his latest.
That came at the Hyundai Tournament of Champions last January and Spieth is now looking to follow it up with another win at the Riviera Country Club in the Genesis.
"It has been a tremendous four years on the PGA Tour with ups and downs,” he said after the win. “I am really looking forward to what is to come, I have had four great starts to the new year.
"I am going down to the Riviera (Country Club) next week and I am not going to let up."
Spieth was taking nothing for granted as he headed into the final round with a comfortable six-shot lead, and he kept his calm to card a two-under-par 70 to finish on 19 under.
"I could afford to make a couple of mistakes today if I needed to but fortunately I didn't and managed to stay ahead," he added.
Spieth is also looking in good shape ahead of The Masters, which starts at Augusta in early April, and will be looking to add to his tally of two Majors, which already includes one Green Jacket.