Kevin Na has a slim lead after three rounds of the Charles Schwab Challenge.
The American has a two-shot lead over five players including Tony Finau, Jordan Spieth and Jim Furyk.
The final round gets underway later on Sunday.
Na tees-off alongside Mackenzie Hughes at 10:05 pm UAE time.
Portugal held by DR Congo in their World Cup opener
Portugal and their talisman Cristiano Ronaldo were left frustrated after Democratic Republic of Congo fought back to earn a 1-1 draw on Wednesday in the African nation's return to the World Cup stage after 52 years.
Gill and Kishan lead India to series win over Afghanistan
Captain Shubman Gill and Ishan Kishan led the way with centuries as they set up India's massive 170-run victory over Afghanistan on Wednesday, sealing the three-match one-day international (ODI) series with two straight wins.
World Cup one-day attendance record broken
Tuesday's four World Cup matches drew a combined 281,223 fans, breaking the 32-year-old single-day tournament record.
Austria triumph on World Cup return with 3-1 win over Jordan
Austria celebrated their long-awaited return to the World Cup with a 3-1 win over determined debutants Jordan on Tuesday, with substitute Marko Arnautovic the difference in a gritty, end-to-end Group J match.
Messi hat-trick equals goalscoring record as Argentina beat Algeria
Lionel Messi has scored a majestic hat-trick to equal the all-time World Cup scoring record, answering doubts about his influence at age 38 and firing up Argentina's title defence with a 3-0 Group J win over Algeria on Tuesday.
