Swanwick failed to qualify for the New Zealand Open last year, but was among three elite national amateurs who received invites to this event at the Millbrook Resort, near Queenstown.
He is set to take up a scholarship at the University of Florida in August and has spent much of the summer playing amateur events in Australia, as well as the Australian Open professional tournament. GolfChannel.com has rated Swanwick the ninth-best golfer in the incoming class of American college recruits.
The New Zealand Open was won by Japanese player Takahiro Hataji, a shot ahead of Australian Scott Hend.
Swanwick finished four shots behind Hataji, as well as finishing seventh overall in the concurrent Pro-Am competition at the New Zealand Open with his amateur partner.