Playing in League event and 7th hole was playing 154 into a little breeze. Pin was a black/white flag tucked into back right corner of green. Pulled an 8iron and started ball in center of green with a little draw being left handed. Could see ball land on green but view was obstructed by bunker on right hand side. Our foursome walked onto the green and couldn't locate my ball. There was a divot about two inches from hole and upon looking in cup realized my ball was in it. This was my 1st hole in one.