Dustin Johnson is among the players chasing Sam Burns at the Genesis Invitational.
From five shots back, four-time major champion Brooks Koepka used an eagle on 17 to complete a memorable win in Scottsdale on Sunday.
Jordan Spieth and Xander Schauffele share a three-stroke lead heading into Sunday's final round.
Xander Schauffele edged into the lead after the second round of the Phoenix Open.
An unheralded American pair top the leaderboard heading into Friday's second round, while Jordan Spieth is four shots back.
American golfer Patrick Reed claimed the largest margin of victory of his career on Sunday.
Amid some controversy at the Farmers Insurance Open, Patrick Reed is tied for the lead with Carlos Ortiz.
Viktor Hovland will carry a lead into the weekend following his late birdie on Friday.
After missing the cut at last week's The American Express, Patrick Reed made a strong start to the Farmers Insurance Open.
Englishman Tyrell Hatton claimed is fourth Rolex Series title with a superb finish round in Abu Dhabi.