He returns ranked third in the world, a three-times winner (twice on the European Tour and once in the United States) and seemingly on a trajectory to become the next great Spanish player after Seve Ballesteros, Jose Maria Olazabal and Sergio Garcia.
Rahm loves playing in California, not far away from where he settled after finishing his time at Arizona State University (ASU).
"When I came here last year I think it was my fourth event as a PGA Tour member," Rahm told reporters on Wednesday.
"Everything was new to me. I did feel like a rookie. I was trying to learn as I went.
"Right now, after a year, I feel a lot more comfortable. I feel like I have what I didn’t have then, which is a developed routine of what to do each week."
The 23-year-old has learnt not to overdo things during a tournament, keeping practise to a minimum. He is also learning how to balance an international schedule without wearing himself out.
He has resisted the lure of heading to the Middle East this week or next for lucrative European Tour events, instead focussing on the PGA Tour's West Coast swing.
"I want to play both tours," he said. "I need to pace myself."
Mickelson, 24 years Rahm's senior, is serving as something of a mentor to the Spaniard and the pair often play practise rounds together.
Mickelson's brother Tim was Rahm's coach at ASU, as well as his former agent before he began caddying for Phil last year.
Mickelson is winless since his 2013 British Open victory at Muirfield, having accrued five runner-up finishes since then without lifting a trophy.
He starts his 2018 campaign after more than two months off, seeking his third victory at a tournament he previously won in 2002 and 2004, albeit at different courses.
The format uses three courses, with the field playing three rounds -- one on each course -- before the cut is made for the final round at the host PGA West Stadium Course in La Quinta.
(Reporting by Andrew Both in Cary, North Carolina; Editing by Peter Rutherford)
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