Bai plays off a +3.5 handicap and is sitting seventh on the New Zealand Order of Merit rankings.
Ideal conditions after overnight rain greeted players for Day 1 of the New Zealand Amateur.
Players have one round of strokeplay today and a second tomorrow.
The top 32 males and top 16 females advance to matchplay, with quarterfinals and semifinals on Saturday and finals on Sunday.
It is the second time Poverty Bay has hosted the amateur, although the first time — 1991 — was solely the men’s amateur for strokeplay and matchplay titles.
Taranaki’s Grant Moorhead won the 72-hole strokeplay and Australia Lucas Parsons beat Moorhead in the matchplay final.