A seven-under 65 left Rickie Fowler in a tie for third after The American Express first round.
Brooks Koepka turned to his trophy cabinet to came out on top in body banter with Bryson DeChambeau.
Tiger Woods' health will be the determining factor for his success this year as he still has the game to win regularly, says Brooks Koepka.
His uncle lost his home in the Australian bushfires and Cameron Smith paid tribute to others affected after winning the Sony Open.
Cameron Smith overcame Brendan Steele in a play-off to win the Sony Open in Hawaii.
Brendan Steele is the man to beat heading into the final round of the PGA Tour tournament in Honolulu.
Brendan Steele and Cameron Davis lead the Sony Open in Hawaii as several big names missed the cut.
Collin Morikawa, 22, carded a flawless five-under-par 65 to top the leaderboard at Waialae Country Club in Honolulu on Thursday.
Tiger Woods will kick off his 2020 PGA Tour season at Torrey Pines and can also be seen at the Genesis Invitational.
After a third play-off hole, Justin Thomas clinched the Tournament of Champions title.