Brendan Steele carded a three-under-par 67 to earn a one-stroke lead after the second round.
Absent since a poor showing at the Genesis Invitational, Tiger Woods will not return to action at Bay Hill.
Rasmus Hojgaard is in position to challenge for his second professional win at the age of 18.
Tom Lewis and Harris English – both competing on sponsor exemptions – carded four-under-par 66s in Palm Beach Gardens, Florida on Thursday.
It was the Italian players who were in focus for a variety of reasons in Muscat, where Guido Migliozzi leads the way.
Italian duo Lorenzo Gagli and Edoardo Molinari entered self-isolation after the former was tested for the coronavirus before being cleared.
American Patrick Reed produced a fine finish to win the WGC-Mexico Championship.
Jon Rahm fired a spectacular 61 on Saturday at the WGC-Mexico Championship, but Justin Thomas sits on top of the leaderboard.
American golfer Bryson DeChambeau sits atop the leaderboard after two rounds in Mexico.