He became the fourth Australian in a row to win the Open, a week after finishing tied for eighth at the New Zealand PGA.
Every day has been a win for the tall, lean golfer from Wollongong since the day he and two others were involved in a nasty smash in the United States. Zunic was in hospital for a week with injuries that included a bad elbow fracture and significant blood loss.
"It was tough coming back from that. I didn't know whether I'd be able to play golf again," Zunic said.
"Since then, it's been a bit of a rollercoaster ride. I've played good, and then not so good. When I started playing again, I just felt so grateful to be breathing and out there playing golf. I could have easily died."
Of the other leading Australians, rising star Cameron Smith had a stunning weekend, carding 64 and 66 to climb to 17-under, alongside 2011 New Zealand Open champion Brad Kennedy. Daniel Fox matched Bransdon's 64 to finish at 16-under, and the ageless Peter Fowler carded a fourth consecutive round in the 60s to end at 15-under.