Key groups

Tigerpalooza begins at 1:40 p.m. ET as Tiger Woods returns to the PGA Tour on the South Course at Torrey Pines alongside Patrick Reed and Charley Hoffman. Defending champion Jon Rahm is out with Jason Day and Brandt Snedeker (1:30, South Course). Phil Mickelson is playing with Justin Rose and Hideki Matsuyama (12:40, North Course). Rickie Fowler is grouped with reigning PGA Tour rookie of the year Xander Schauffele and Patrick Cantlay (12:30, North Course).