Phil Mickelson will return to the PGA Tour as he aims for an improved 2015, starting at the Humana Challenge - which tees off on Thursday.
American Mickelson - who has registered 42 wins on the Tour - went without a trophy in 2014.
It was the first time since 2003 that he failed to win a tournament in a calendar year, and he could only produce one top-10 finish - showing that it was not a case of close calls for the left-hander.
As a result, Mickelson slipped to 16th in the world rankings, but an extensive fitness program during the off-season has the 44-year-old confident of improvement ahead of his first tournament of the new season.
"It was a bad year statistically in all areas," Mickelson told his official website.
"I didn't drive the ball as well as I can or expected to. My short irons were worse than they've been in my entire career.
"My short game really wasn't sharp. My putting was not at the level I expect.
"In the first five or six weeks [of my fitness program] I've had some immediate results.
"Im getting lighter, developing more core strength and speed and increasing my ball speed.
"It's been a while since I felt so at ease."
Mickelson has history on his side, being a two-time winner of the event.
The set-up of the tournament changed in 2012, and is now played over three courses - the Palmer Private Course, Nicklaus Private and La Quinta Country Club.
Palmer Private is the official host, but all players will play one round on each course before the cut is made after 54 holes.
American Patrick Reed is the defending champion and won at the Tournament of Champions earlier in January.
Reed's compatriots Matt Kuchar, Brandt Snedeker and Zach Johnson should all be in the mix.
Venezuelan Jhonattan Vegas won the title in 2011 and will also compete, while Luke Donald and Francesco Molinari are some of the drawcard internationals.
Robert Allenby was still listed in the official field on Monday, despite the Australian's claims that he was kidnapped, robbed and bashed in Hawaii last week.
Police are still investigating the incident after Allenby missed the cut at last week's Sony Open - won by American Jimmy Walker.