Rasmus Hojgaard is in position to challenge for his second professional win at the age of 18.
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.
Runner-up last year, Rory McIlroy grabbed a first-round lead at the WGC-Mexico Championship.
Rory McIlroy will not give up his "autonomy and freedom" for the sake of big money, and has ruled out joining the Premier Golf League.
Golf events scheduled for Kuala Lumpur and China in April have been postponed, though it is hoped they can still be staged in 2020.
Min Woo Lee closed out victory at the Vic Open to clinch his first European Tour crown.