Dustin Johnson, a two-time winner of the tournament when it was part of the European tour schedule, withdrew Thursday before the start with an injury the Asian Tour described as “tweaking his back.”
The $5 million tournament has several players who have signed with Saudi-backed LIV Golf and whose season is still three weeks away from starting.
The Daily Telegraph reported that Munoz will be signing with LIV.
British Open champion Cameron Smith, the highest-ranked player in the field at No. 4 in the world, opened with a 73.