Tommy Fleetwood and Keegan Bradley earned a share of the four-stroke lead following respective scores of 66 and 68 on Friday.
It is all to play for at Doha Golf Club, where South Africans George Coetzee and Justin Harding share the lead with Mike Lorenzo-Vera.
Rafa Cabrera-Bello carded a seven-under-par 65 to set the early pace in Orlando, Florida on Thursday.
Only three shots separate the top 37 players on the leaderboard in Doha, where Adri Arnaus and Justin Walters set the early pace.
Justin Thomas said he was hurt by remarks from the USGA, which has now backtracked on its critique of the nine-time PGA Tour winner.
Tiger Woods has been suffering with a neck strain in recent weeks and it will force him out of the Arnold Palmer Invitational.
The Hall of Famer finished his first PGA Tour Champions event at 1-over 220.
It appears Justin Thomas and the USGA will meet after a contentious rules violation by Adam Schenk.
American Keith Mitchell celebrated his breakthrough triumph on Sunday, after finishing ahead of Brooks Koepka and Rickie Fowler.
A couple of late birdies were enough to give Kurt Katayama the title on a hectic final day in Muscat.