Key groups

Tournament ambassador Phil Mickelson, a winner of 42 PGA Tour titles including five majors and victories in the 2002 and 2004 CareerBuilder Challenge, makes his 2018 debut Thursday alongside two-time major champion Zach Johnson (12:10 p.m. ET, La Quinta Country Club). World No.

3 Jon Rahm and two-time Masters champion Bubba Watson are paired

(11:40 a.m., La Quinta). Patrick Reed and Brandt Snedeker, members of the

2016 U.S. Ryder Cup team, make their

2018 debuts together (11:40 a.m., Nicklaus Tournament Course).