Zunic needed a birdie at 18 to avoid a playoff .
Zunic hit a superb approach shot to just two feet , calmly tapping in the putt to finish at 21 - under 266 .
Needing a birdie at 18 to avoid a playoff , Zunic hit a superb approach shot to just two feet , calmly tapping in the putt to finish at 21 - under 266 .